A polar plot intersects the unit circle at a point making -45° to the negative real axis then the phase margin of the system is :

A polar plot intersects the unit circle at a point making -45° to the negative real axis then the phase margin of the system is :

(a) -45°

(b) 45°

(c) 180°-45°

(d) 180°+45°

This question was addressed to me in an online interview.

My doubt stems from Closed-Loop Frequency Response topic in section Stability in Frequency Domain of Control Systems

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A polar plot intersects the unit circle at a point making -45° to the negative real axis then the phase margin of the system is :

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