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Consider the following statements for an incompressible fluid flowing through a convergent-divergent duct:               

1. The convergent part acts as a nozzle.

2. The divergent part acts as a diffuser.

3. The maximum limiting speed of the fluid is the sonic velocity.

Which of these statements are correct?

A) 1, 2 and 3                     

B) 1 and 2 only

C) 2 and 3 only                 

D) 1 and 3 only