Step 1: Understanding NISAR.
NISAR is a joint NASA-ISRO (Indian Space Research Organization) Earth observation mission that will use dual-frequency SAR (L-band and S-band) for remote sensing applications.
Step 2: Purpose and expansion of NISAR.
- NISAR stands for NASA-ISRO Synthetic Aperture Radar.
- It is designed for global environmental monitoring, disaster response, and resource management.
- It will be the first dual-frequency radar imaging satellite.
Step 3: Selecting the correct option.
Since NISAR stands for NASA-ISRO Synthetic Aperture Radar, the correct answer is a. NASA-ISRO Synthetic Aperture Radar.