What is the z-transform of the signal x(n) = -αnu(-n-1)?

• A. \(\frac{1}{1-\alpha z^{-1}}\);ROC |z|b) \(-\frac{1}{1+\alpha z^{-1}}\);ROC |z|c) \(-\frac{1}{1-\alpha z^{-1}}\);ROC |z|>|α|
• B. \(-\frac{1}{1-\alpha z^{-1}}\);ROC |z|