IT application owners having sole responsibility for architecture approval (B) is a major concern because it indicates a lack of oversight and segregation of duties. EA decisions should be reviewed by a cross-functional governance body to ensure alignment with security, compliance, and business objectives.
Other options:
The CIO chairing the review board (A) may indicate centralized leadership but is not inherently a risk.
EA governing non-IT projects (C) may indicate scope expansion but is not a security risk.
Security requirements being reviewed (D) is a best practice and not a concern.
Reference: ISACA CISA Review Manual, IT Governance and Management of IT

The auditor's next action after finding that there is an informal unwritten set of standards in the IS department is to document and test compliance with the informal standards. This is because the auditor's role is to evaluate the adequacy and effectiveness of the existing controls, regardless of whether they are formal or informal, written or unwritten. The auditor should also assess the risks and implications of having informal standards, such as lack of consistency, accountability, or traceability. The auditor should not make recommendations, postpone the audit, or finalize the audit without performing the audit procedures. References:
* CISA Review Manual (Digital Version), Chapter 2, Section 2.21
* CISA Online Review Course, Domain 1, Module 1, Lesson 12

Referential integrity is a property of data that ensures that all references between tables are valid and consistent. Disabling referential integrity controls can result in orphaned records, data anomalies, and inaccurate queries. The most effective way to compensate for the lack of referential integrity is to perform periodic table link checks, which verify that all foreign keys match existing primary keys in the related tables.
More frequent data backups, concurrent access controls, and performance monitoring tools do not address the issue of data consistency and accuracy. References: ISACACISA Review Manual 27th Edition, page 291

Periodic review of scheduled jobs is crucial to prevent unauthorized or outdated jobs from running, which could lead to security risks, data inconsistencies, or compliance issues. If the inventory of scheduled jobs is not reviewed periodically (A), it could result in jobs running with incorrect parameters, unauthorized transfers, or failure to decommission obsolete processes.
Other options:
Automated support ticket creation (B) is beneficial but is not as critical as ensuring the overall accuracy and security of job execution.
Restricting access to scheduling changes (C) is a security control, but its absence is not the most pressing concern compared to unreviewed jobs.
Notification alerts to a support group (D) is a good practice but does not replace the need for a formal review process.
Reference: ISACA CISA Review Manual, Information Systems Operations and Business Resilience

Compliance testing ensures that the organization's incident response processes align with established cybersecurity frameworks and policies. This methodology provides objective and reliable conclusions about the maturity of incident response capabilities.
* Judgmental Sampling (Option A): Relies on subjective judgment and is less reliable.
* Data Analytics Testing (Option B): Useful for identifying trends but may not assess process maturity comprehensively.
* Variable Sampling (Option C): Appropriate for statistical analysis but less effective in process maturity assessments.
Reference: ISACA CISA Review Manual, Job Practice Area 2: Information Systems Audit and Assurance.