Which statement about NISAR at launch is most accurate?

Correct option is B

The correct answer is (b) It flies dual L-band (NASA) and S-band (ISRO) SARs in sun-synchronous orbit, with ~12-day global repeat.
Explanation:
· NISAR stands for  NASA-ISRO Synthetic Aperture Radar mission, a joint Earth-observation satellite mission between the space agencies of the United States and India.
· The satellite is specifically designed to use  dual frequencies: an L-band Synthetic Aperture Radar (developed by NASA/JPL) and an S-band SAR (developed by ISRO).
· It operates in a sun-synchronous orbit and maps nearly all of the Earth's land and ice surfaces, providing a complete global coverage repeat cycle every  12 days. 
Information Booster:
· The NISAR satellite was successfully launched on July 30, 2025, aboard the GSLV-F16 launch vehicle from the Satish Dhawan Space Centre in Sriharikota, India.
· It is the first radar of its kind in space to systematically use two different radar frequencies, which allows it to detect subtle changes in the Earth's surface with centimeter-level precision.
· The data from the mission is used for monitoring natural hazards like earthquakes, tsunamis, volcanoes, and landslides, as well as tracking climate change impacts like glacier melt and changes in soil moisture. 
Additional Knowledge:
(a) It flies only an S-band SAR and images every 3 days
· This statement is incorrect because NISAR uses  both L-band and S-band radars, and its repeat cycle is 12 days, not 3 days. 
(c) It is a geostationary radar mission for monsoon nowcasting
· This is incorrect. NISAR is in a sun-synchronous Low Earth Orbit (LEO), not a geostationary orbit. Geostationary satellites stay over a fixed point on the equator, while NISAR orbits the poles. 
(d) It was launched by SpaceX from Vandenberg
· This is incorrect. The satellite was launched by ISRO's GSLV-F16 rocket from Sriharikota, India