Consider the following statements in respect of slow sand filter and rapid sand filter:1. The two filters differ in respect of the standards regarding non-uniformity of the sans used in their filtering media.2. The two filters do not differ in respect of the effective size of the sand used in them.3. The tow filters differ in respect of their respective under-drainage system.4. The two filters differ in respect of their respective rate of filtration.Which of the above statements are correct?

Consider the following statements in respect of slow sand filter and r

1.	Consider the following statements in respect of slow sand filter and rapid sand filter:1. The two filters differ in respect of the standards regarding non-uniformity of the sans used in their filtering media.2. The two filters do not differ in respect of the effective size of the sand used in them.3. The tow filters differ in respect of their respective under-drainage system.4. The two filters differ in respect of their respective rate of filtration.Which of the above statements are correct?
A.	1, 2 and 3
B.	1, 2 and 4
C.	2, 3 and 4
D.	1, 3 and 4
Answer» E.

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