Correct Answer : Option (C) - 2025
The Indian Air Force will retire one of its four remaining squadrons, MiG-21 (Russian combat aircraft) fighter jets by 2022 September and other three scheduled to be phased out by 2025.
The old MiG-21s will be replaced with newer fighter jets.
The air force received its first single-engine MiG-21 in 1963.
The fighter jet has been participated in many operations like Safed Sagar (Kargil, 1999), operation of India in Pakistan in February 2019,.Source : Business Standard