Which of the following is a key duty of a security guard?

Monitoring and reporting suspicious activities is a fundamental duty of a security guard. This responsibility encompasses observing the environment for any unusual behavior or situations that could pose a threat to safety or security. By being vigilant and attentive, a security guard can quickly identify potential risks and take the appropriate action, whether that involves intervening directly, notifying law enforcement, or providing detailed reports for further investigation.

This duty is critical in preventing incidents such as theft, vandalism, or unauthorized access to restricted areas. It also serves to maintain a safe environment for employees and the public, thereby fostering a sense of security within the area being monitored.

The other choices represent roles or responsibilities that typically fall outside the scope of a security guard's duties. For instance, performing maintenance on security systems, writing policies for the security department, and managing company finances are tasks usually designated to specialized personnel or management roles within an organization. While understanding these areas might enhance a guard's knowledge, they do not directly align with the primary responsibilities expected from someone in a security position.