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The purpose of Halon (FM-200) in fire suppression systems primarily revolves around its ability to extinguish fires by displacing oxygen. Halon is a halocarbon compound that suppresses fire through a chemical reaction that interrupts the combustion process. By reducing the amount of oxygen available to sustain a fire, Halon effectively prevents flames from spreading.

In environments where sensitive equipment is present, such as data centers or telecommunication facilities, it becomes crucial to extinguish fires without causing damage to these assets. Halon's effectiveness in rapidly reducing the oxygen levels while functioning without leaving residue makes it an ideal choice for protecting such valuable equipment.

Other options focus on actions that Halon does not perform. For instance, cooling down an area is not the primary function of Halon since its role is to chemically interrupt combustion rather than physically lower temperatures. Likewise, while enhancing visibility and fire detection are important for fire safety, they are not tasks that Halon is designed to execute in a fire suppression context. Hence, the targeted function of displacing oxygen for fire suppression specifically in sensitive environments makes the correct choice clear.