A technician is installing a liquid cooling system for a high-end gaming PC. Which of the following liquids is MOST likely used for cooling?

Iodine is a chemical element with no properties that make it suitable as a PC coolant and would damage components.

Mercury is highly toxic, extremely corrosive to aluminum and copper components, and is never used in PC cooling systems.

Thermal paste is a viscous compound applied between a CPU and heatsink to improve thermal contact - it is not a liquid circulated in a cooling loop.

Mineral oil (a type of oil) is a non-conductive, non-corrosive liquid used in oil-immersion cooling systems for high-end PCs. It transfers heat away from components effectively without risking electrical shorts, making it the only practical coolant among the listed options for a liquid cooling installation.