An internal auditor discovered a control weakness that needs to be communicated to management.

A. Draft report:Delays action on the weakness, which could be addressed sooner.

B. Preliminary observation document:While helpful, this is not as immediate as verbal communication.

C. Final report:Waiting until the final report would unnecessarily delay corrective action.

D. Verbal communication during the engagement, followed by the final report issuance:Correct. Verbal communication allows immediate management action, with documentation to follow.

CIA Exam Syllabus Reference:

Domain V: Performing Internal Audit Services – Effective Communication of Findings.