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The correct answer is option (b): Only two. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2025, GS Paper 1, as Question 84. It falls under Science and Technology > Defence Technology.
This question is rated "moderate". It requires sound conceptual understanding of the topic.
UPSC has asked 25 questions from Defence Technology (under Science and Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.