The correct answer is D. All of the mentioned.
A MOSFET (metalâoxideâsemiconductor field-effect transistor) is a type of transistor that uses a voltage to control the flow of current between two terminals. It is a three-terminal device, with the gate terminal controlling the current flow between the source and drain terminals.
The MOSFET consists of a semiconductor layer, a metal layer, and a layer of silicon-dioxide. The semiconductor layer is typically made of silicon, which is a type of material that can conduct electricity under certain conditions. The metal layer is typically made of aluminum or gold, which are good conductors of electricity. The layer of silicon-dioxide is a thin insulator that separates the metal layer from the semiconductor layer.
When a voltage is applied to the gate terminal, it creates an electric field that attracts or repels the charge carriers in the semiconductor layer. This changes the conductivity of the semiconductor layer, which in turn controls the flow of current between the source and drain terminals.
MOSFETs are used in a wide variety of electronic devices, including computers, cell phones, and televisions. They are also used in power electronics, such as inverters and power supplies.