Consider the following expressions which indicate the step or impulse response of an initially relaxed system

1. [5 - 4 e^-2t] u(t)
2. [e^-2t + 5] u(t)
3. d(t) + 8 e^-2tu(t)
4. d(t) + 4 e^-2tu(t)

Those which correspond to the step and impulse response of the same system include

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