In which situations is it appropriate for a security guard to use force?

The appropriate circumstances for a security guard to use force revolve primarily around the necessity of self-defense or the defense of others from immediate harm. This principle is rooted in the legal understanding of self-defense, which allows an individual to protect themselves or others when faced with an imminent threat of physical harm.

In scenarios where a security guard perceives a direct threat to themselves or others, the use of reasonable force becomes justifiable. The emphasis on "immediate harm" is crucial, as it indicates that the use of force should only be a response to an actual, present danger rather than a proactive measure against potential issues or future threats.

This principle reinforces the idea that force must be proportional and necessary, avoiding excessive or preemptive actions. Such guidelines ensure that security personnel remain within the boundaries of the law and uphold their duty to protect others responsibly.

The other options fail to align with the legal and ethical standards governing security personnel's use of force. For instance, resorting to force merely based on a feeling of threat lacks a concrete basis in reality, and using force to prevent potential theft or obey superior instructions without assessing the situation properly could lead to unnecessary escalation or abuse of power.