Detailed
B . Review current monitoring logs to determine resource usage on the web portal: Reviewing logs helps the administrator understand current resource utilization and identify whether the current setup can handle additional load before making changes.
References:
CompTIA Cloud+ CV0-003 Study Guide Chapter 17: Operation of a Cloud Environment.

Containers are a type of deployment technology that packages an application and its dependencies into a lightweight and portable unit that can run on any platform or environment. Containers can help deploy a single application that has different versions in an existing IaaS instance, as they can isolate and run multiple versions of the same application without any conflicts or interference. Containers can also enable faster and easier deployment, scaling, and management of cloud-based applications. Reference: CompTIA Cloud+ Certification Exam Objectives, page 11, section 1.6

SaaS (Software as a Service) is a cloud service model that provides fully managed applications to the end users. The users do not have to worry about installing, updating, or maintaining the software, as the cloud provider handles all these tasks. Examples of SaaS are Gmail, Office 365, Salesforce, etc.

Reference:
A web application firewall (WAF) is a type of firewall that monitors and filters HTTP traffic to and from a web application. It can detect and block malicious requests, such as SQL injection, cross-site scripting, or denial-of-service attacks. It can also provide session-based granular control of HTTP traffic, such as allowing or denying access based on user identity, location, or behavior. Reference: CompTIA Cloud+ Certification Exam Objectives, Domain 2.0 Security, Objective 2.2 Given a scenario, implement appropriate network security controls for a cloud environment.

RPO (Recovery Point Objective) is the metric that the administrator should refer to determine how much data would be lost if a server had to be restored from backups. RPO is a metric that measures how much data can be lost or how far back in time a recovery point can be without causing significant impact or damage. RPO can help to determine how much data would be lost by comparing the time of the disruption or disaster with the time of the last backup or snapshot. RPO can also help to determine how frequently backups or snapshots should be performed to minimize data loss.