In which of following scenarios is the internal auditor performing benchmarking?

Benchmarking in internal auditing involves comparing the performance or practices of the audited entity against a standard or best practice, which often involves using information from other organizations or sources as a reference. This process helps identify areas for improvement and set performance targets. Thus, comparing the collected information with similar information from another source is the correct definition of benchmarking.

The Institute of Internal Auditors (IIA) Practice Guide: Internal Audit and Organizational Performance

IIA Standard 1220 - Due Professional Care