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 = ?(7/8), Kc = 45/4

D. w = 1, Kc = 13

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