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If the unit step response of a network is $\left(1-e^{-\alpha t}\right)$, then its unit impulse response is

1. $\alpha e^{-\alpha t}$
2. $\alpha^{-1} e^{-\alpha t}$
3. $\left(1-\alpha^{-1}\right) e^{-\alpha t}$
4. $(1-\alpha) e^{-\alpha t}$