Science and Technology · Defence Technology

With reference to recent developments in defence technology and equipment, consider the following pairs: I. Mk-II(A) – Directed-energy laser weapon designed to neutralise drones, missiles and other airborne threats II. INS Arihant – Nuclear-powered submarine capable of launching ballistic missiles for strategic deterrence III. Heron Mk-II – Medium-altitude long-endurance unmanned aerial vehicle used for surveillance and reconnaissance IV. CATS Warrior – Next-generation air-launched torpedo equipped with advanced propulsion and guidance How many of the pairs given above are correctly matched?