Consider the following statements regarding the response time of a photodiode:
A. It depends on the transit time of carriers in the depletion region.
B. It depends on the diffusion time of carriers outside the depletion region.
C. It depends on the RC time constant of the diode and external circuit.
D. The transit time is given by t_d = w / v_d, where w is the depletion width and v_d is the drift velocity.
E. The transit time is given by t_d = v_d / w.

Choose the correct answer from the options given below: