What is the role of ultraviolet radiation in water purification systems? 1. It inactivates/destroys harmful microorganisms present in water. 2. It removes all the undesirable odors present in the water. 3.It accelerates the sedimentation of all the solid particles present in the water, removes turbidity and improves the purity of the water. Which of the above statement(s) is/are correct?

• A. only 1
• B. 2 and 3
• C. 1 and 3
• D. all these