Which of the following is an example of heightened security measures?

The installation of security cameras exemplifies heightened security measures because it serves as a proactive approach to monitoring and protecting a facility. Security cameras provide continuous surveillance, allowing for the detection of suspicious activities and potential threats in real-time. This enhanced visibility contributes to overall safety and deterrence, as visible security measures can prevent individuals from engaging in illicit behavior.

In contrast, options that suggest open access, the absence of security personnel, or lengthy check-in queues do not indicate increased security. Open access can lead to unmonitored entry points, lacking a controlled and secure environment. Similarly, having no security personnel present minimizes active deterrence and response capabilities. Long queues for check-in may simply reflect operational inefficiencies rather than security advancements. Therefore, the installation of security cameras stands out as a clear example of implementing elevated security protocols.