The position (in thousands of feet) of a car driving along a straight road at time $t$ in minutes is given by the function $y = s(t)$ that is pictured below.

Which graph A-F is the best representative of the derivative function $s'(t)$? ? A B C D E F

A		B		C
D		E		F

(Note: the vertical axes of these graphs may have been scaled to to fit these functions. Click on a graph to enlarge it.)

Which of the following statements are true? Select all that apply.

A. The function $s'$ represents the acceleration of the car.

B. If $s'(t)$ is zero, then $s(t)$ must be zero.

C. When the car slows down, $s'(t)$ is negative.

D. When $s'(t)$ is zero, the car is stopped.

E. When $s'(t)$ is positive, the car's position is increasing.

F. The function $s'$ represents the velocity of the car.

G. When $s'(t)$ is positive, the car's position is decreasing.

H. None of the above statements are true.