The z-transform of discrete time signal x[n] is defined

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The z-transform of discrete time signal x[n] is defined as—

1. _∞
  x(z) = x[n].z^{– n}
  ^{n = – ∞}
2. ₀
  x(z) = x[n].z^{– n}
  ^{n = – ∞}
3. _∞
  x(z) = x[n].z^{– n}
  ^{n = – 0}
4. ₁
  x(z) = x[n].z^{– n}
  ^{n = 0}

Correct Option: A

NA