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Difference between the active heat sink and passive heat sink is that passive heat sink?

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Difference between the active heat sink and passive heat sink is that passive heat sink?

(a) Possess mechanical components

(b) Possess electrical components

(c) Do not possess mechanical components

(d) Do not possess metal components

The question was asked in an interview for internship.

This key question is from Heat Sink for Power Transistor-1 topic in division Power Amplifier of Analog Circuits

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Correct choice is (c) Do not possess mechanical components

The explanation: Unlike active heat sink passive heat sink do not possess any mechanical component and are made of aluminum finned radiator. Thus these passive heat sinks are cheaper than the active ones and only use convection to dissipate thermal energy. They are more reliable since they have no moving parts but the performance of active sinks is better in dissipating heat.

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