Final answer:
Salute an officer when reporting to them.
Step-by-step explanation:
The correct answer is C) When reporting to an officer.Saluting an officer is a military protocol and it is generally done to show respect and acknowledgment of their higher rank. It is customary to salute an officer when reporting to them or when they approach you. This gesture is a sign of military discipline and hierarchy.
For example, let's say you are a soldier and you are reporting to your commanding officer. As you approach the officer, you would come to attention and salute. It is important to note that saluting should be done when in uniform.