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Correct Answer: Option D — **4 December**. **4 December** is the accurate answer because it recalls the Indian Navy’s role in Operation Trident during the 1971 war. This identifying fact establishes its correct connection with commemorative day and distinguishes it from the other defence-related choices. Why the other options are incorrect: Option A — **General Bipin Rawat**: This is actually associated with historic appointment; specifically, he assumed office as the first Chief of Defence Staff on 1 January 2020. Option B — **Supersonic cruise missile**: This is actually associated with cruise missile; specifically, BrahMos is a supersonic cruise missile developed through an India–Russia joint venture. Option C — **Heavy-lift transport helicopter**: This is actually associated with transport helicopter; specifically, the tandem-rotor Chinook carries troops, artillery, equipment and supplies in heavy-lift missions. Exam Takeaway: Link **4 December** with its exact **commemorative day** association for fast **Indian Defence GK** revision.
