Question: In the Bode plot of a unity feedback control system, the value of phase of (G(j omega)) at the gain cross over frequency is (-125^{circ}).

In the Bode plot of a unity feedback control system, the value of phase of $G(j \omega)$ at the gain cross over frequency is $-125^{\circ}$. The phase margin of the system is
(a) $-125^{\circ}$
(b) $-55^{\circ}$
(c) $55^{\circ}$
(d) $125^{\circ}$

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