Why is it vital for a security guard to investigate suspicious activity?

Investigating suspicious activity is crucial for a security guard primarily because it plays a key role in preventing potential criminal acts and ensuring the safety of individuals and property in the area. When security personnel are vigilant and proactive in examining unusual behaviors or situations, they can often avert crimes before they escalate.

This proactive approach not only protects the immediate environment but also fosters a sense of security among the people present. By addressing potential threats early, security guards contribute significantly to the overall safety and security of the location they are assigned to, whether it's a building, event, or area.

While the other choices mention aspects related to authority or involve escalation to law enforcement, they do not emphasize the essential purpose of avoiding harm and maintaining safety, which is the primary responsibility of a security guard.