The main difference between feedback control and feedforward control is ____.
A. one affects the manipulated variable, while the other affects the measured disturbance
B. one occurs after the controlled variable changes while the other tries to prevent the controlled variable from changing
C. the speed at which corrections to a disturbance is made
D. one is controlled by an inner loop and the other is controlled by an outer loop
E. both b and c
Answer: E
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