Decide whether each of the following statements are T-True, or F-False.

A) Velocity anti-nodes of standing air waves occur at closed ends of tubes.
B) Pressure nodes of standing air waves occur at closed ends of tubes.
C) Velocity nodes of standing air waves occur at open ends of tubes.
D) Pressure anti-nodes of standing air waves occur at open ends of tubes.

I thought it was TFFT but it said it was not. Can anyone explain to me why that is incorrect please?