Condition for the unstability of system

Q.  A system is said to be unstable if
- Published on 27 Nov 15

a. None of the poles of its transfer function is shifted to the right half of s-plane
b. At least one zero of its transfer function is shifted to the right half of s-plane
c. At least one pole of its transfer function is shifted to the right half of s-plane
d. At least one pole of its transfer function is shifted to the left half of s-plane

ANSWER: At least one pole of its transfer function is shifted to the right half of s-plane

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