What does "safety on" indicate regarding a firearm?

When the term "safety on" is used in the context of a firearm, it indicates that the safety mechanism is engaged, which prevents the gun from being fired. This is a critical safety feature designed to minimize the risk of accidental discharge. When the safety is on, the trigger cannot be pulled, ensuring that the firearm cannot be discharged unintentionally. This aspect of firearm operation is fundamental to responsible handling and storage practices, as it promotes a higher level of safety when the firearm is not in active use.

While the other options describe various states or actions related to firearms, they do not accurately reflect the meaning of "safety on." Firearms should always be treated as if they are loaded and capable of firing, which underscores the importance of the safety mechanism in preventing unintentional firing.