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1. The Nyquist plot of a stable, transfer function G(s) is shown in the figure. We are interested in the stability of the closed loop system in the feedback configuration shown. Which of the following statements is true?
(A): G(s) has a zero in the right-half plane
(B): G(s) is an all-pass filter
(C): G(s) is marginally stable
(D): G(s) is the impedance of a passive network
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