Which of the following is non-linear circuit parameter?

Answer: Option D

The non-linear circuit parameter among the given options is Transistor.

A transistor is a semiconductor device that can amplify and switch electronic signals. It exhibits non-linear behavior, which means the output current or voltage is not directly proportional to the input current or voltage. The relationship between the input and output of a transistor is governed by complex exponential functions and is highly dependent on the operating conditions and biasing. This non-linearity makes transistors crucial components in various electronic circuits, enabling functions like amplification and signal processing.