In Nyquist stability criterion, N = Z – P, where N represents the number of clock-wise encirclements of point:
A+1 + j0
B0 + j0
C-1 + j0
D0 - j1
Explanation
The Nyquist stability criterion evaluates closed-loop stability by analyzing open-loop frequency response encirclements of the critical point (-1 + j0) in the complex s-plane.

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