The Staff Nurse Has Challenged the Appraisal Rating Given by a New

The staff nurse has challenged the appraisal rating given by a new nurse manager. What should the nurse manager do?

A) Do not change the rating as that will undermine the manager's authority.
B) Change the rating immediately as the staff nurse has more experience than the manager.
C) Investigate the staff nurse's challenge and change the rating if it is justified.
D) Ask another staff nurse to act as a mediator in the challenge.