A discrete-time all-pass system has two of its poles at 0...

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A discrete-time all-pass system has two of its poles at 0.25<0° and 2<30°. Which one of the following statements about the system is TRUE?

A. It has two more poles at 0.5<30° and 4<0°

B. It is stable only when the impulse response is two-sided

C. It has constant phase response over all frequencies

D. It has constant phase response over the entire z-plane

Answer: Option B

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