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Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?

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Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?

A. w = 1/√14, Kc = 45/7 √14
B. w = √(7/6), Kc = 46/3
C. w = 1, Kc = 13
D. w = √(7/8), Kc = 45/4