The correct answer is "Disipador de calor" (heat sink) and "CPU" (central processing unit). A heat sink is a component that helps dissipate heat generated by the CPU, preventing it from overheating. The CPU is the main component of a computer that performs most of the processing tasks. Therefore, it is essential for the heat sink to be in contact with the CPU through a thermal compound to efficiently transfer and dissipate heat. The other options, such as the motherboard, fan, and capacitors, do not require direct contact with a thermal compound for their functioning.