The best actions are F and A .

F. Urgently contact the certification body and explain the situation — Correct

This is the first and most important action. In a third-party certification audit, the certification body controls the audit programme, audit team appointment, audit duration, audit competence, and certification process. If a team member leaves unexpectedly, especially where that person is also evaluating a first-time audit team leader, the certification body must be informed immediately so it can decide how the audit should proceed.

A. Ask the auditee if they could accept to extend the audit till the following day — Correct

Because the second auditor could return the next day, extending the audit is a practical solution, provided the certification body agrees. This helps ensure the planned audit activities, required audit time, audit team competence, and evaluation of the audit team leader can still be completed properly.

The other options are not the best responses:

B is too extreme. The audit does not need to be cancelled immediately if it can be completed by adjusting the plan with certification body approval.

C is not appropriate without certification body approval, because continuing alone may reduce planned audit coverage and affect audit team competence or required audit duration.

D is not sufficient because the auditee cannot decide whether the certification audit can continue with a changed audit team.

E is less suitable than F because you should first explain the full situation to the certification body. The certification body may then decide whether a replacement audit team leader is needed, whether the audit should be extended, or whether another action is required.

Therefore, the correct selected options are A and F .