Which of the following points is NOT on the root locus of

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Which of the following points is NOT on the root locus of a system with the open-loop transfer function
G(s) H(s) = K
s(s + 1)(s + 3)

1. s = – j √3
2. s = – 1.5
3. s = – 3
4. s = – ∞

Correct Option: B

Root-locus is drawn below.