Consider the following statements :

Pumps in series operation allow the head to increase.

Pumps in series operation increase the flow rate.

Pumps in parallel operation increase the flow rate.

Pumps in parallel operation allow the head to increase.

Which of these statements are correct ?

- 1
  
  1 and 3
- 2
  
  1 and 4
- 3
  
  2 and 4
- 4
  
  3 and 4

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