With reference to the Polar Satellite Launch Vehicle (PSLV), consider the following statements:
1.PSLV is a four-stage launch vehicle with alternating solid and liquid propulsion stages.
2.Its third stage (PS3) uses a liquid propellant motor.
3.PSLV has been used for important missions such as Chandrayaan-1 and the Mars Orbiter Mission.
Which of the statements given above is/are correct?