A. PM of Japan
B. Secretary General UNO
C. President of Republic of Korea
D. President Security Council
🧠 Explanation:
Ban Ki-moon served as Secretary-General of the UNO, leading global diplomacy and international cooperation from 2007 to 2016. “Secretary-General” is a noun, and “served” is a verb. Alternatives like “head” or “chief” exist, but Secretary-General is the formal, recognized title. His tenure focused on peacekeeping and sustainable development.
