Question: Figure shows the Nyquist plot of the open-loop transfer function (mathrm{G}(s) mathrm{H}(s)) of a system. If (mathrm{G}(s) mathrm{H}(s)) has one right-hand pole, the closed-loop system

Figure shows the Nyquist plot of the open-loop transfer function $\mathrm{G}(s) \mathrm{H}(s)$ of a system. If $\mathrm{G}(s) \mathrm{H}(s)$ has one right-hand pole, the closed-loop system is
(a) always stable.
(b) unstable with one closed-loop right hand pole.
(c) unstable with two closed-loop right hand poles.
(d) unstable with three closed-loop right hand poles.

@=0 wo positive- (-1,0) Im GH plane Re

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