If $$Z$$ transform of $$x(n)$$ is $$X(z)$$ then the $$Z$$ transform of $$x(n - k)$$ is .............

A

$$X(z^{-k} z)$$

B

$$X(z^{k} z)$$

C

$$z^{-k} X(z)$$

D

$$z^{k} X(z)$$