Which of the following is NOT one of the three functions of an alarm system?

The correct answer identifies that monitoring is not classified as one of the three main functions of an alarm system.

An alarm system generally serves three primary functions: detection, notification, and control. Detection refers to the system's ability to identify unauthorized entry or other security breaches, such as smoke or carbon monoxide alarms. Notification involves alerting the user or the monitoring service when an alarm condition occurs, ensuring that appropriate action can be taken in response. Control pertains to the capability to manage the security system, including arming and disarming the system or controlling other associated systems like cameras or access control.

Monitoring, while an important aspect of security systems, is often seen as a supplementary function where the system is connected to a third-party service to ensure constant oversight. Monitoring operates in combination with the main functions of detection, notification, and control but does not stand alone as one of the foundational functions of an alarm system itself.