Answer : 3. "सूबेदार संजय कुमार"
Explanation :

Bipin Rawat has been appointed as India’s first Chief of Defense Staff. The CDS would be a four-star single-point military adviser to the Defence Ministry. 

It was suggested by the Kargil Review Committee in 1999 which was headed by K. Subrahmanyam. The CDS would have to serve up to a maximum age of 65 years and would be heading the Department of Military Affairs. 

The Department of Military Affairs would be created within the Ministry of Defense and would function as its Secretary. 

Please note that the tenure was 3 years or up to the retirement age of 62 years, whichever is earlier and it has now set to the age of 65. 

The CDS would also head all tri-services defense institutions such as the National Defense Academy, College of Defense Management and the National Defense College.