Consider the following statements for a two dimensional potential flow:
1. Laplace equation for stream function must be satisfied
2. Laplace equation for velocity potential must be satisfied
3. Streamlines and equipotential lines are mutually perpendicular
4. Streamlines can intersect each other in very high speed flows
Which of the above statements are correct?
(a) 1 and 4 (b) 2 and 4
(c) 1, 2 and 3 (d) 2, 3 and 4