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Which of the following is not a result of tempering?

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Which of the following is not a result of tempering?

(a) Increased ductility

(b) Improved toughness

(c) Increased electrical conductivity

(d) Internal stresses are relieved

This question was addressed to me by my school teacher while I was bunking the class.

Asked question is from Tempering in chapter Heat Treatment of Engineering Material & Metallurgy

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The correct answer is (c) Increased electrical conductivity

The explanation is: Martensite formed during the hardening process is too brittle and lacks toughness and ductility. This makes it unusable for many applications. Therefore, a heat treatment process called tempering is done to bring about these changes.

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