The impulse response h(t) of the filter matched to the input pulse s(t) is :

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Option 2 :
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Concept:

The shown bock diagram will be considered as the receiver in digital communication.

The impulse response of the filter is calculated by:

h(t) = s*(Tb - t)

Calculation:

In the given signal the duration is T. So, Tb = T

The shifted signal by T is given by:

s(t+T)

The time-reversed signal will be

Option 2 is correct.

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