Across the normal shock, fluid properties change in such a manner that the:
1. Velocity of flow is subsonic
2. Pressure increases
3. Specific volume decreases
4. Temperature decreases
Which of the above are correct?
(A) 1, 2, 3, and 4 (B) 2, 3 and 4 only
(C) 1 and 4 only (D) 1, 2 and 3 only