If the impulse response of a discrete-time system is h[n] = -5nu[- n - 1], then the system function H(z) is equal to
A. $${{ - z} \over {z - 5}}$$ and the system is stable
B. $${z \over {z - 5}}$$ and the system is stable
C. $${{ - z} \over {z - 5}}$$ and the system is unstable
D. $${z \over {z - 5}}$$ and the system is unstable
Answer: Option B
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