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What is meant by thermosetting plastic?

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What is meant by thermosetting plastic?

(a) It softens on heating and returns to original hardness on cooling

(b) It hardens on heating and retains hardness on cooling

(c) It hardens on heating and returns to original hardness on cooling

(d) It softens on heating and retains hardness on cooling

This question was posed to me during a job interview.

The above asked question is from Materials in portion Materials of Corrosion Engineering

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Correct answer is (b) It hardens on heating and retains hardness on cooling

The explanation: Plastics are readily divided into two types based on their thermal behavior. One is thermoplastic and another one is thermosetting. Thermosetting polymers are the polymers that harden on heating and retains hardness on cooling.

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