Which one of the following statements is correct in respect of the theory of stability? (a) phase

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Which one of the following statements is correct in respect of the theory of stability?

(a) phase margin is the phase angle lagging, in short of \(180^{\circ}\), at the frequency corresponding to a gain of 10.

(b) gain margin is the value by which the gain falls short of unity, at a frequency corresponding to \(90^{\circ}\) phase lag.

(c) Routh-Hurwitz criterion can determine the degree of stability.

(d) gain margin and phase margin are the measure of the degree of stability.

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