What are common types of security technology used by guards?

The correct choice identifies common types of security technology that are essential for security guards to effectively monitor and respond to incidents. CCTV (Closed-Circuit Television) systems play a critical role in surveillance, allowing guards to observe and record activities in various areas, which enhances safety and provides evidence if needed. Communication devices such as radios and smartphones enable security personnel to coordinate with each other, report incidents in real-time, and call for assistance when necessary, facilitating a quick and organized response to security threats.

Other options do not reflect technologies specifically tailored or widely used in the security industry. For instance, laptops and projectors are tools primarily used for administrative tasks or presentations rather than direct security applications. Similarly, while metal detectors and smoke detectors may play roles in safety and security in certain environments, they are not as central to the day-to-day functions of most security guards, especially in terms of monitoring and communication. Lastly, the notion that only armed security equipment is relevant fails to consider the diverse tools that support prevention, observation, and response in a security context.