The correct answer is: A. Lead-compensation
Lead compensation is a type of control system compensation that uses a lead network to improve the system’s transient response. A lead network is a network that has a zero at a finite frequency and a pole at a higher frequency. The zero causes the system’s response to rise faster, while the pole causes the system’s response to decay more slowly. This can improve the system’s overshoot and settling time.
Lag compensation is a type of control system compensation that uses a lag network to improve the system’s steady-state error. A lag network is a network that has a pole at a finite frequency and a zero at a lower frequency. The pole causes the system’s response to decay more slowly, while the zero causes the system’s response to rise more slowly. This can improve the system’s steady-state error.
Lead-lag compensation is a type of control system compensation that uses a combination of lead and lag networks to improve both the system’s transient response and its steady-state error. This is often the best type of compensation to use when the system has both fast and slow dynamics.
In the case of adding zeros to a transfer function, the result is a lead network. This is because the zero causes the system’s response to rise faster, while the pole at infinity causes the system’s response to decay more slowly. This can improve the system’s overshoot and settling time.