GATE EC 2016 Set 1 Q32 — Circuit Analysis

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 $X, Y, Z$  with the corresponding time responses for $t \geq 0$:

$\begin{array}{ll}\text{X:Impulse}&\text{P: }1 – e^{-t/T}\\\text{Y:Unit step}&\text{Q: }t – T(1 – e^{-t/T})\text{ }\\\text{Z:Ramp}&\text{R: }e^{-t/T}\end{array}$