An internal auditor determined that the organization ' s accounting system was designed to reject...

Audit observations are structured around the 4Cs: Condition, Criteria, Cause, and Consequence.

Criteria = what “should be.”

Condition = what “is.”

Cause = why the deviation occurred.

Consequence = effect or risk.

In this case, the correct criteria is that each invoice should be recorded only once in the accounting system (Option A). Options B and C describe condition and consequence, while Option D is irrelevant.