Answer : 3. "डीआरडीओ"
Explanation :

India is on track to deploy its long-range air defense system operationally by 2028-29. This indigenous system is designed to detect and destroy a wide range of threats including stealth fighters, aircraft, drones, cruise missiles and precision-guided weapons at ranges up to 350 km. The ambitious project known as Project Kusha is under the purview of the Defense Research and Development Organization (DRDO). The Long Range Surface to Air Missile (LR-SAM) is being developed to provide interception capabilities similar to the Russian S-400 Triumf air defense system recently inducted into the Indian Air Force (IAF).