Cavitation in hydraulic machines occurs at

Question

Consider the following statements:

Cavitation in hydraulic machines occurs at

1. The exit of pump  
2. The entry of the pump
3. The exit of a turbine

Which of these statements are correct?

a) 1 and 2                    b) 1 and 3

c) 1,2 and 3                 d) 2 and 3