By mid-2026, the NISAR (NASA-ISRO Synthetic Aperture Radar) satellite, a joint project by NASA and ISRO, will have gathered over two years of observational data. What is its primary scientific objective?

1. ATo explore the lunar south pole for water ice deposits.
2. BTo track changes in Earth's ecosystems, ice sheets, and land surfaces with high resolution.
3. CTo provide real-time weather forecasting and cyclone tracking for the Indian subcontinent.
4. DTo act as a communication relay for India's Gaganyaan manned spaceflight mission.