A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system
(A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1.
(C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1
(A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1.
(C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1