Which of the following represents the region of convergence (ROC) of a causal sequence in the Z-domain?

Correct option is C

​$$\text{For a causal sequence (right-sided sequence) in the } z\text{-domain:} \\[8pt]\bullet \ \text{The Region of Convergence (ROC) lies outside the magnitude of the outermost pole.} \\[4pt]\bullet \ \text{It extends to infinity in the } z\text{-plane.} \\[4pt]\bullet \ \text{This condition ensures that the } z\text{-transform converges for causal systems.} \\[10pt]\textbf{Summary of ROC properties:} \\[6pt]\bullet \ \text{Causal sequence: ROC is outside the outermost pole} \\[4pt]\bullet \ \text{Anti-causal sequence: ROC is inside the innermost pole} \\[4pt]\bullet \ \text{Two-sided sequence: ROC lies between poles}$$​​