The symbols, a and T, represent positive quantities, and u(t

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31

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The symbols, a and T, represent positive quantities, and u(t) is the unit step function. Which one of the following impulse responses is NOT the output of a causal linear time-invariant system?

[GATE EE 2019]

A e-a(t – T)u(t)

B e+atu(t)

C 1 + e-at u(t)

D e-a(t + T)u(t)