The correct answer is: A. Integrator.
An integrator is a type of control system that increases the steady state accuracy of a system by adding a time delay to the output signal. This time delay allows the system to “average out” any noise or disturbances in the input signal, resulting in a more accurate output signal.
A differentiator is a type of control system that increases the system’s response to changes in the input signal. This is done by taking the derivative of the input signal, which amplifies any changes in the signal. However, this can also lead to instability in the system, so it is important to use a differentiator with caution.
A phase lead compensator is a type of control system that increases the phase margin of a system. This is done by adding a lead network to the system, which increases the phase angle of the output signal relative to the input signal. This can help to stabilize the system and improve its performance.
A phase lag compensator is a type of control system that decreases the phase margin of a system. This is done by adding a lag network to the system, which decreases the phase angle of the output signal relative to the input signal. This can help to reduce the overshoot and settling time of the system.
In conclusion, the correct answer is A. Integrator.