For a second-order differential equation, if the damping ration ζ is

1.	For a second-order differential equation, if the damping ration ζ is unity, then
A.	The poles are imaginary and complex conjugate
B.	The poles are in the right half of s-plane
C.	The poles are equal, negative and real
D.	Both the poles are unequal, negative and real
Answer» D. Both the poles are unequal, negative and real

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For a second-order differential equation, if the damping ration ζ is unity, then

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