Correct option is D
A variable resistor is a component where the resistance value can be changed, and it can be of two main types based on how the resistance changes with respect to the position of the wiper.
Linear type: In a linear variable resistor, the change in resistance is directly proportional to the change in wiper position. This means if you move the wiper halfway, the resistance will change by half.
Logarithmic type: In a logarithmic variable resistor, the change in resistance is proportional to the logarithm of the wiper position. This means that the resistance change is smaller at the beginning and larger at the end of the wiper's travel.
