An organization relies on an external vendor that uses a cloud-based Software as a Service (SaaS) model to back up its data. SaaS is a model in which the software is centrally hosted and accessed by the user via a web browser using the internet1. The vendor owns and maintains the software and the data, and the organization pays for the use of the service on a subscription or usage basis1. The greatest risk to the organization related to data backup and retrieval is that the vendor may be unable to restore critical data.
Data backup and retrieval are essential processes for ensuring the availability, integrity, and security of data in case of loss, corruption, or damage2. Data backup is the process of creating and storing copies of data in a separate location from the original data2. Data retrieval is the process of accessing and restoring the backed-up data when needed2. Critical data are data that are vital for the operation, continuity, and recovery of the organization3.
If the vendor is unable to restore critical data, the organization may face severe consequences, such as:
* Business disruption: The organization may not be able to perform its core functions, deliver its products or services, or meet its customer or stakeholder expectations3.
* Revenue loss: The organization may lose income, market share, or competitive advantage due to reduced sales, customer dissatisfaction, or reputation damage3.
* Legal liability: The organization may face lawsuits, fines, or penalties for breaching contractual, regulatory, or statutory obligations related to data protection, privacy, or security3.
* Recovery cost: The organization may incur additional expenses for repairing or replacing the lost or corrupted data, restoring the system functionality, or compensating the affected parties3.
The other options are not as great as the vendor's inability to restore critical data. The organization may be locked into an unfavorable contract with the vendor, which may limit its flexibility, control, or choice over the service quality, cost, or duration4. However, this risk can be mitigated by negotiating better terms and conditions, reviewing the contract periodically, or switching to another vendor if possible4. The vendor may be unable to restore data by recovery time objective (RTO) requirements, which are the maximum acceptable time frames for restoring data after a disruption5. However, this risk can be reduced by setting realistic and achievable RTOs, monitoring the vendor's performance, or implementing alternative recovery strategies if needed5. The organization may not be allowed to inspect the vendor's data center, which may limit its visibility, transparency, or assurance over the service provider's infrastructure, security, or compliance.
However, this risk can be overcome by requesting third-party audits, certifications, or reports from the vendor that demonstrate their adherence to industry standards and best practices. Therefore, option B is the correct answer.
References:
* What is SaaS? Software as a Service | Microsoft Azure
* What is Data Backup? - Definition from Techopedia
* Critical Data Definition
* The Risks of Cloud Computing | Cloud Academy
* Recovery Time Objective (RTO) Definition
* [Cloud Computing Security Risks: What You Need To Know | CloudHealth by VMware]

The best audit procedure to determine whether a firewall is configured in compliance with the organization's security policy is reviewing the parameter settings. Parameter settings are values or options that define how a firewall operates and functions, such as rules, filters, ports, protocols, etc. By reviewing the parameter settings of a firewall, an IS auditor can verify whether they match with the organization's security policy, which is a document that outlines the security objectives, requirements, and guidelines for an organization's information systems and resources. Reviewing the system log is a possible audit procedure to determine whether a firewall is configured in compliance with the organization's security policy, but it is not the best one, as a system log records events or activities that occur on a firewall, such as connections, requests, responses, errors, alerts, etc., and may not indicate whether they comply with the organization's security policy. Interviewing the firewall administrator is a possible audit procedure to determine whether a firewall is configured in compliance with the organization's security policy, but it is not the best one, as a firewall administrator may not provide accurate or reliable information about the firewall configuration, and may have conflicts of interest or ulterior motives. Reviewing the actual procedures is a possible audit procedure to determine whether a firewall is configured in compliance with the organization's security policy, but it is not the best one, as actual procedures describe how a firewall is configured and maintained, such as installation, testing, updating, etc., and may not reflect whether they comply with the organization's security policy.

Signature-based intrusion detection systems (IDS) are systems that compare network traffic with predefined patterns of known attacks, called signatures. The effectiveness of signature-based IDS depends on how well they can detect new or unknown attacks that are not in their signature database. Therefore, an increase in the number of detected incidents not previously identified is the best indicator of the effectiveness of signature-based IDS, as it shows that they can recognize novel or modified attacks.

The auditor's primary concern when capacity management for a key system is being performed by IT with no input from the business would be an unanticipated increase in business's capacity needs. This could result in performance degradation, service disruption or customer dissatisfaction if IT is not able to provide sufficient capacity to meet the business demand. Failure to maximize the use of equipment, cost of excessive data center storage capacity or impact to future business project funding are secondary concerns that relate to resource optimization or budget allocation, but not to service delivery or customer satisfaction. References: ISACA, CISA Review Manual, 27th Edition, 2018, page 374

Audit frameworks can assist the IS audit function by providing direction and information regarding the performance of audits. Audit frameworks are sets of standards, guidelines, and best practices that help IS auditors plan, conduct, and report on their audit engagements. Audit frameworks can help IS auditors ensure the quality, consistency, and professionalism of their audit work, as well as comply with the expectations and requirements of the stakeholders and regulators. Audit frameworks can also help IS auditors address the specific challenges and risks of auditing information systems and technology.
Defining the authority and responsibility of the IS audit function is not a way that audit frameworks can assist the IS audit function, but rather a way that the IS audit charter can assist the IS audit function. The IS audit charter is a document that defines the purpose, scope, objectives, and authority of the IS audit function within the organization. The IS audit charter can help IS auditors establish their role and position in relation to other functions and departments, as well as clarify their rights and obligations.
Providing details on how to execute the audit program is not a way that audit frameworks can assist the IS audit function, but rather a way that the audit methodology can assist the IS audit function. The audit methodology is a set of procedures and techniques that guide IS auditors in performing their audit tasks and activities. The audit methodology can help IS auditors apply a systematic and structured approach to their audit work, as well as use appropriate tools and methods to collect and analyze evidence.
Outlining the specific steps needed to complete audits is not a way that audit frameworks can assist the IS audit function, but rather a way that the audit plan can assist the IS audit function. The audit plan is a document that describes the scope, objectives, timeline, resources, and deliverables of a specific audit engagement. The audit plan can help IS auditors organize and manage their audit work, as well as communicate their expectations and responsibilities to the auditees.
References:
* ISACA, CISA Review Manual, 27th Edition, 2019, p. 51 1
* Understanding Project Audit Frameworks - Wolters Kluwer 2
* How to Implement a Robust Audit Framework - Insights - Metricstream 3
* What Is The Internal Audit Function? An Accurate Definition Of The