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What is the nature of the coefficient of resistance of an insulator?

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What is the nature of the coefficient of resistance of an insulator?

(a) Positive

(b) Negative

(c) Zero

(d) Infinite

This question was addressed to me during a job interview.

This question is from Electrical Properties in section Properties of Engineering Materials of Engineering Material & Metallurgy

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Correct option is (d) Infinite

The explanation is: The coefficient of resistance of an insulator and a semiconductor material is generally negative. It is usually positive for pure metals. Zero coefficient values can be obtained by alloying with a specific type of metals.

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