Choose the CORRECT equation for the acceleration in terms of distance (s) and velocity (v).

A

$$a = \frac{ds}{dt}$$

B

$$a = \frac{d^2s}{dt^2}$$

C

$$a = \frac{dv}{dt}$$

D

Both $$a = \frac{d^2s}{dt^2}$$ and $$a = \frac{dv}{dt}$$