Which of the following situations is most likely to impair internal audit objectivity?

An internal auditor reports both functionally and administratively to the chief financial officer (CFO).

An internal auditor, who was an accounts receivable intern for the organization three years prior, performs an audit of the accounts receivable cycle.

According to policy, the internal auditor must obtain approval from the CFO prior to requesting information for internal audit purposes.

An internal auditor performs an audit in a department that is led by the auditor's close friend.