What is a heat sink?

A technician says that your laptop is running slowly because your heat sink may have come loose. What is a heat sink?

A) A heat sink uses cool water to lower the temperature of motherboard components.

B) A heat sink is a fan that sits directly on processors to provide additional cooling.

C) A heat sink is used to pull cool air through computer cases to lower the overall case temperature.

D) A heat sink dissipates heat from computer components through thermal conduction.