Answer: Defence Research and Development Organisation (DRDO)
Notes: Recently, India is developing the K-6 hypersonic Submarine-Launched Ballistic Missile (SLBM) to strengthen strategic deterrence and naval power. It is being developed by the Defence Research and Development Organisation’s (DRDO) Advanced Naval Systems Laboratory in Hyderabad. The K-6 will be deployed on advanced S-5 class SSBNs (nuclear-powered ballistic missile submarines) of the Indian Navy, larger than Arihant class.
