What does an insulator do?

Question 9 options:

An insulator slows heat transfer.

An insulator warms a substance.

An insulator cools a substance.

An insulator emits electromagnetic radiation.

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I believe the correct answer from the choices listed above is the first option. An insulator slows heat transfer. Thermal insulation is the reduction of heat transfer between objects in thermal contact or in range of radiative influence. Hope this answers the question.