In the (mathrm{GH}(s)) plane, the Nyquist plot of the loop transfer function (mathrm{G}(s) mathrm{H}(s)=frac{pi e^{-0.25 s}}{s}) passes

Question:

In the $\mathrm{GH}(s)$ plane, the Nyquist plot of the loop transfer function $\mathrm{G}(s) \mathrm{H}(s)=\frac{\pi e^{-0.25 s}}{s}$ passes through the negative real axis at the point
(a) $(-0.25, j 0)$
(b) $(-0.5, j 0)$
(c) $(-1, j 0)$
(d) $(-2, j 0)$

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