Step 1: Meaning.
Ex-officio means "by virtue of office." It refers to authority attached to a position rather than the individual.
Step 2: Example.
The Vice-President of India is ex-officio Chairman of Rajya Sabha. His authority is derived from the office he holds, not personal appointment.
Step 3: Conclusion.
Thus, the correct term is Ex-Officio.
Match List-I with List-II 