The primary basis on which audit objectives are established is the consideration of risks12. This involves identifying and assessing the risks that could prevent the organization from achieving its objectives12. The audit objectives are then designed to address these risks and provide assurance that the organization's controls are effective in managing them12. While audit risk, assessment of prior audits, and business strategy are important factors in the audit process, they are secondary to the fundamental requirement of considering risks12.
References:
Objectives of Auditing - Primary and Secondary Objectives of Auditing | Auditing Management Notes Audit Objectives | Primary and Subsidiary Audit Objectives - EDUCBA

When auditing the closing stages of a system development project, the most important consideration should be the user acceptance test (UAT) results. The UAT is a critical phase of the system development life cycle (SDLC) that ensures that the system meets the functional requirements and expectations of the end users. The UAT results provide evidence of the system's quality, performance, usability, and reliability. Control requirements, rollback procedures, and functional requirements documentation are also important considerations, but they are not as crucial as the UAT results in determining if the system is ready for deployment. References: CISA Review Manual (Digital Version)1, page 325.

An IS auditor should be consulted during the requirements definition phase to recommend security controls.
This ensures that security considerations are integrated from the beginning of the software development life cycle, leading to more secure software design and implementation.
References
* ISACA CISA Review Manual 27th Edition, Page 240-241 (SDLC Phases)

Job scheduling ensures that system resources are allocated efficiently by prioritizing high-priority tasks during peak periods. It prevents resource contention by scheduling less critical jobs at off-peak times or when resources are underutilized. This method is the most direct and effective way to ensure adequate resources for essential activities.
* System Virtualization (Option A):While useful for optimizing resource utilization, it does not prioritize activities dynamically.
* Zero Trust (Option C):This is a security framework and does not address resource allocation.
* Code Optimization (Option D):This improves performance but is not directly related to resource scheduling.
Reference:ISACA CISA Review Manual, Job Practice Area 3: Information Systems Operations and Business Resilience.