Which one of the following represents the impulse response

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Which one of the following represents the impulse response of a system defined by H(z) = z^{– m}?

1. u[n – m] (x)
2. δ[n – m]
3. δ[m](x)
4. δ[m – n]

Correct Option: B

Since, if δ(n) ⎯⎯⎯⎯ z-transform → 1
Then, δ(n – m) ⎯⎯⎯⎯ z-transform → z^{– m}.1
(by using shifting property)
Hence, alternative (B) is correct answer.