Which of the following is NOT typically part of a security system?

A security system is primarily designed to protect property, assets, and individuals through various forms of detection and monitoring. Intrusion detection devices are essential components that alert personnel to unauthorized access attempts, while signal alarms serve as notifications when a breach occurs. Surveillance cameras play a critical role by allowing for visual monitoring and recording of activities in and around a property, providing valuable evidence in case of incidents.

Firearms, while they may be utilized by certain types of security personnel, such as armed guards, do not constitute a typical component of a security system itself. The emphasis of a security system is more on surveillance, detection, and response technologies that function independently of the security personnel's armament. Therefore, the presence of firearms is not included in the standard framework of security systems, making this option the one that is not typically part of such a system.