Which of these statements are correct?

Question

Consider the following statements pertaining to kinematics and dynamics of fluid flow:                           

1. For $\Psi$ = x² – y², velocity at (1, 1) is $2\sqrt{2}$

(2) For all types of flow, stream and potential functions exist.

(3) Bernoulli’s equation is not valid for real fluid flow.

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