‘INS Dhruv’, India's First Indigenous Nuclear Missile Tracking Ship

Current Context: India commissioned ‘INS Dhruv, which is an ocean surveillance and nuclear missile tracking vessel. Its code name is VC 11184.

• With this, India has become a 5th country to have a tracking vessel after the USA, France, Russia and China
• It is jointly developed by the Defence Research and Development Organisation (DRDO), Indian Navy and National Technical Research Organisation (NTRO)
• It is built by Hindustan Shipyard Ltd at its Visakhapatnam facility under the Atma Nirbhar Bharat Abhiyan initiative at the cost of Rs 725 crore
• The INS Dhruv will be used to monitor missile launched from long distances, to monitor the telemetry data of strategic missiles, detect the launch of missiles by adversary nations and to monitor the Indian Ocean bed
• It will also help to create maritime domain awareness for India in the Indian Ocean
• Static Part: 
• HQ of DRDO and NTRO: New Delhi
• Chairman of DRDO: Dr G Satheesh Reddy

Question: 

Q: 1: Who among the following developed ‘INS Dhruv’, ocean surveillance and nuclear missile tracking vessel?
a. Indian Navy
b. DRDO
c. NTRO
d. All of the above