Explanation:

- Option 1: "deputes" typically means to appoint someone as a substitute or delegate a task, but it doesn't fit well here.

- Option 2: "replaces" implies taking over a role completely and permanently, which isn't usually the case with a Vice-Principal filling in temporarily.

- Option 3: "officiates" is the correct choice. It means to perform the duties of an office, usually for a brief period or in an official capacity temporarily.

- Option 4: "exchanges" suggests a swap or trade, which doesn't apply to performing a role in someone's absence.