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Electronic surveillance systems are considered a high-security measure because they provide continuous monitoring of sensitive areas, allowing for the detection of unauthorized access or suspicious activity in real-time. These systems typically include cameras, motion detectors, and alarm systems that work together to enhance security. Unlike other measures, electronic surveillance offers a level of vigilance that can track activities 24/7, which is crucial in high-security environments such as military installations, correctional facilities, or secure government buildings.

Random patrols, while beneficial for maintaining a visible security presence and deterring potential incidents, do not provide the same level of continuous monitoring as electronic systems. Signage serves as a deterrent and provides information about security protocols, but it lacks the active monitoring aspect of electronic surveillance. Visitor logs help track who enters and exits a facility, which is important for accountability, but they do not provide real-time observation or immediate response capability. Overall, electronic surveillance systems are integral to high-security measures due to their effectiveness in monitoring and responding to security threats.