Alphymus

A student steps onto a stationary elevator and stands on a bathroom scale. The elevator then travels from the top of the building to the bottom. The student records the reading on the scale as a function of time.
At what time(s) does the student have maximum downward velocity?

(A) At all times between 2 s and 4 s
(B) At 4 s only
(C) At all times between 4 s and 22 s
(D) At 22 s only
(E) At all times between 22 s and 24 s