If a(n) is the response of a linear, time-invariant, discrete-time

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If a(n) is the response of a linear, time-invariant, discrete-time system to a unit step input, then the response of the same system to a unit impulse input is

1. d/dn [a(n)]
2. na (n)
3. a(n) – a(n – 1)
4. a(n + 1) – 2a(n) + a(n – 1)

Correct Option: A

NA