Unit impulse response of a system is given as c(t) = –

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Unit impulse response of a system is given as c(t) = – 4e^–t + 6 e^–2t The step response of the same system for t ≥ 0 is equal to

1. – 3e^{– 2t} + 4 e^{– t} – 2
2. – 3e^{– 2t} + 4 e^{– t} + 1
3. – 3e^{– 2t} + 4e^{– t} – 1
4. 3e^{– 2t} + 4e^{– t} – 1

Correct Option: C

Step response is integral of unit impulse response

= 4e^{– t} – 3e^{– 2t} – 1