What is the role of ultraviolet(UV) radiation in th water purification system?
1. It inactivates/kills the harmful micro-organisms in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles and improves the clarity of water.
Which of the statements given is/are correct?
A) 1 only
B) 2and 3 only
C) 1 and 3 only
D) 1,2 and 3