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Consider a feedback system with gain margin of about 30. At what point does Nyquist plot crosses negative real axis?

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Consider a feedback system with gain margin of about 30. At what point does Nyquist plot crosses negative real axis?

(a) -3

(b) -0.3

(c) -30

(d) -0.03

I got this question in my homework.

Query is from Nyquist Stability Criterion in division Stability in Frequency Domain of Control Systems

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Right choice is (b) -0.3

To explain: Gain Margin is always inverse of the point which cuts the Nyquist on the real axis.

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