Science and Technology · Space Technology

With reference to India's satellite launch vehicles, consider the following statements: I. One of the Indian launch vehicles employs a cryogenic engine, whereas the other does not use cryogenic propulsion at any stage. II. A launch vehicle primarily meant for polar and low Earth orbits differs from another that is capable of placing satellites into geosynchronous transfer orbit. III. The number of propulsion stages is identical in both Polar Satellite Launch Vehicle and Geosynchronous Satellite Launch Vehicle. Which of the statements given above correctly highlight the differences between PSLV and GSLV?