Q1. In the context of ISRO's 2025 launches, NISAR is best described as which one of the following?
- A. A joint NASA-ISRO earth-observation satellite carrying a dual-band (L- and S-band) synthetic aperture radar
- B. India's first dedicated solar observatory placed in a halo orbit around the L1 Lagrange point
- C. An uncrewed Gaganyaan crew-module test vehicle for validating re-entry and parachute deceleration
- D. A commercial communications satellite launched for the U.S. firm AST SpaceMobile