The correct answer is:
(b) Compensating op-amp
Op-amps that require external compensating components are often referred to as compensating op-amps. These components (typically capacitors) are added to modify the frequency response of the op-amp, ensuring stable operation in certain applications, especially at high frequencies. Compensation is typically used to reduce the bandwidth of the op-amp to improve its transient response and reduce issues like instability or oscillation.
Compensation helps to balance the phase margin and the gain-bandwidth product to achieve desired performance across the specified range of operating conditions.