According to IIA guidance, the CAE has the ultimate responsibility for the internal audit activity but may delegate tasks such as reviewing, approving, and signing engagement reports to qualified internal audit staff. This delegation helps in managing workload and leveraging expertise within the team. However, the CAE should still periodically review the reports to maintain oversight and ensure quality. Reference: = IIA Standard 2060 - Reporting to Senior Management and the Board, and Standard 2400 - Communicating Results.