A first-order low-pass filter of time constant T is excited with different input signals (with zero initial conditions up to t = 0). Match the excitation signals X, V, Z with the corresponding time responses for t ≥ 0:
Match List-I with List-II and select the correct answer:

List-I	List-II
X. Impulse	P. $$1 - {e^{ - {t \over T}}}$$
Y. Unit step	Q. $$t - T\left( {1 - {e^{ - {t \over T}}}} \right)$$
Z. Ramp	R. $${e^{ - {t \over T}}}$$

A. X-R, Y-Q, Z-P

B. X-Q, Y-P, Z-R

C. X-R, Y-P, Z-Q

D. X-P, Y-R, Z-Q

Answer: Option C