Consider the feedback system shown in the figure The Nyquist plot...

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Consider the feedback system shown in the figure. The Nyquist plot of G(s) is also shown. Which one of the following conclusions is correct?

A. G(s) is an all-pass filter

B. G(s) is a strictly proper transfer function

C. G(s) is a stable and minimum-phase transfer function

D. The closed-loop system is unstable for sufficiently large and positive k

Answer: Option D

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