The switching circuit is nothing butSelect one:a. the base-biased transistor in CB configuration.b. the base-biased transistor in CE configuration.c. the base-biased transistor in CC configuration.d. the base-biased transistor with tank circuit.

The switching circuit is typically the base-biased transistor in CE (Common Emitter) configuration. So, the correct answer is b. the base-biased transistor in CE configuration.

Here's why:

In a switching circuit, the transistor is used as a switch. It has two states: ON and OFF. In the ON state, it conducts current, and in the OFF state, it doesn't.

The Common Emitter (CE) configuration is most commonly used for this purpose because it can amplify both voltage and power, and it has a phase difference of 180 degrees between the input and output. This makes it suitable for digital logic circuits, where a signal is either high (ON) or low (OFF).

The other configurations (CB - Common Base and CC - Common Collector) are less commonly used for switching circuits. The CB configuration is often used in frequency mixer and power amplifier applications, while the CC configuration is used in impedance matching applications.

The tank circuit (option d) is a type of circuit that uses an LC oscillator to produce an oscillating signal, and it's not typically used in switching applications.