For the transfer function of a physical two–port network :

1.	For the transfer function of a physical two–port network :
A.	All the zeros must lie only in the left half of the s – plane
B.	The poles may lie anywhere in the s – plane
C.	The poles lying on the imaginary axis must be simple
D.	All poles and zeroes should be in the left half s plane.
Answer» D. All poles and zeroes should be in the left half s plane.

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