Consider the following statements & chose the correct option
1. RISAT-1 is an optical imaging satellite.
2. RISAT-1 is radar imaging satellite.
3. RISAT-1 is built using totally indigenously technology.
4. RISAT -1 is India's first Radar Imaging Satellite.
Options
a) Only 2 is correct
b) 2 & 3 are correct
c) 2, 3 & 4 are correct
d) 1 & 3 are correct