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Which type of temperature dependent resistor exhibits a positive temperature coefficient of resistivity?

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Which type of temperature dependent resistor exhibits a positive temperature coefficient of resistivity?

(a) Thermistor

(b) Sensistor

(c) Varistor

(d) Photoresistor

I have been asked this question in an international level competition.

Asked question is from Thermistor and Sensistor Compensation in section Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

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Correct option is (b) Sensistor

The best explanation: Sensistor is a temperature dependent device whose resistance is dependent upon temperature. It has a direct variation with respect to change in temperature & hence usually appropriate for bias compensation.

Its functionality is accurately opposite to that of thermistor which exhibits negative temperature coefficient of resistivity.

As the resistance of sensistor increases due to increase in temperature, it is also supposed to have the property of positive temperature coefficient of resistivity.

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