Detailed Explanation:

Rationale for Correct Answer: Conflict of interest is often uncovered through proactive investigative methods such as tips, vendor ownership review, and employee interviews. Underbilling schemes, however, relate to Financial Statement Fraud and Revenue Recognition Manipulation , not conflict of interest detection.

Analysis of Incorrect Options:

A. Tips & Complaints – Common detection method; many corruption schemes are revealed this way.

B. Review of vendor ownership files – Critical to identify hidden ownership ties.

D. Interviews with purchasing personnel – Helps detect suspicious relationships or favoritism.

Key Concept: Detection of Conflict of Interest schemes .