Select the correct option to test your answer: A Phase margin is the phase angle lagging, in short of 180°, 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° phase lag C Routh's-Hurwitz criterion can determine the degree of stability. D Gain margin and phase margin are the measure of the degree of stability Correct Answer: Option D (Gain margin and phase margin are the measure of the degree of stability) Verified correct option for Electronics and Communication (Control Systems).