The Region of Convergence (ROC) of the z-transform of a causal unit step discrete-time sequence is

The Region of Convergence (ROC) of the z-transform of a causal unit st

1.	The Region of Convergence (ROC) of the z-transform of a causal unit step discrete-time sequence is
A.	\|z\| < 1
B.	\|z\| ≤ 1
C.	\|z\| > 1
D.	\|z\| ≥ 1
Answer» D. \|z\| ≥ 1