Consider the following statements:1. The quality of waste water is determined on the basis of DO.2. The BOD test is based on DO.3. Determination of DO helps in controlling corrosion.Which of the above statements are correct?

Consider the following statements:1. The quality of waste water is det

1.	Consider the following statements:1. The quality of waste water is determined on the basis of DO.2. The BOD test is based on DO.3. Determination of DO helps in controlling corrosion.Which of the above statements are correct?
A.	1, 2 and 3
B.	1 and 2 only
C.	1 and 3 only
D.	2 and 3 only
Answer» C. 1 and 3 only