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Which of the following are the functions of a volute casing in a centrifugal pump?

1. To collect water from the periphery of the impeller and to transmits it to the delivery pipe at a constant velocity.

2. To increase the discharge of the pump.

3. To increase the efficiency of the pump.

4. To reduce the loss of head in discharge.

Select the correct answer from the codes given below:

A) 1, 2 and 3                     

B) 2, 3 and 4

C) 1, 3 and 4                     

D) 1 and 2