Which one of the following statements regarding reciprocating pump is correct ?

Friction head is mainly responsible for causing cavitation in a reciprocating pump at the beginning of the suction stroke.

Effect of acceleration pressure on reciprocating pumps appears parabolic and has the maximum effect at the middle of the delivery stroke.

Air vessel reduces the acceleration head and consequently reduces the effect of friction head also.

The maximum permissible suction lift in a double acting reciprocating pump is independent of vapour pressure.