The correct option is D Special Frontier Force
The Special Frontier Force(SFF) is a Special Operations Forces (SOF) unit which specialises in unconventional warfare and covert operations behind enemy lines. Thus, SFF Commandos are trained for extreme conditions, with special attention paid to guerrilla tactics, mountain warfare, parachute jumps, hostage rescue and counter-terrorism operations. SFF came to be known as Establishment 22 due to General Singh, a Military Cross holder and a legendary figure in the British Indian Army, who commanded the 22nd Mountain Regiment during World War II in Europe and a Long-Range Desert Squadron in North Africa.