According to IIA guidance, which of the following actions is a chief audit executive required...

According to IIA guidance, the chief audit executive is required to report the results of the quality assurance and improvement program, including external assessments, at least annually. This ensures that the board and senior management are kept informed about the internal audit activity’s conformance with the Standards and other aspects of audit quality.

IIA's International Standards for the Professional Practice of Internal Auditing on Quality Assurance and Improvement.