Which of the following statements accurately describe the internal components and function of operational amplifiers (op-amps)? Select all that apply.

Operational amplifiers are built from a few core parts that work together. First, a differential input stage compares two input voltages and produces a large voltage difference that is amplified by a gain stage; this gives the op‑amp its huge open‑loop gain. Next, the output stage drives the external load, often using a push‑pull transistor pair to provide current to the circuit. Biasing networks keep the internal transistors in their active region so the device can respond linearly. For example, in a non‑inverting amplifier the op‑amp’s internal differential amplifier produces a large voltage that the output stage then supplies to the load, while the feedback resistor controls the overall gain.