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The transfer function for a PID controller is (where, η i is the integral (reset) time and ηD is the derivative time.) ?

/ Process Control and Instrumentation / By
The transfer function for a PID controller is (where, η i is the integral (reset) time and ηD is the derivative time.) ?

A. Kc(1 + ηis + ηD ). s
B. Kc[1 + (1/ηis) + ηD . s)
C. Kc(1 + ηis + (1/ηD . s)
D. None of these