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The unstable system is
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G(s) H(s) = K ; K > 0 (T1s + 1)(T2s + 1)
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G(s) H(s) = K(s + 1) ; K > 91 s2(s + 4)(s + 5)
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G(s) H(s) = K(s + 2) ; K > 2 (s + 1)(s - 3)
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G(s) H(s) = K ; -1 < K < 2 (Ts + 1)3
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Correct Option: B
Characteristic equation is
s4 + 9s3 + 20s2 + Ks + K = 0
Routh table is as shown below.
For stability, 0 < K < 99.
