Consider the following statements with respect to centrifugal pumps: S1, S2, S3, and S4. Choose the correct statement (s)
S1: Pumps in series operation allow the head to increase.
S2: Pumps in series operation increase the flow rate.
S3: Pumps in parallel operation increase the flow rate.
S4: Pumps in parallel operation allow the head to increase.
1
S1 and S3
2
S3 and S4
3
S1 and S2
4
S2 and S4