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The strategy that focuses on preventing incidents in perimeter security is deterrence. This approach involves measures designed to discourage potential attackers from attempting to breach security boundaries. By implementing deterrent strategies, such as visible security personnel, signage indicating surveillance, and strong physical barriers, organizations can create an environment that discourages unauthorized access or malicious activities from occurring in the first place.

Deterrence is rooted in the principle that the potential costs or consequences of an attack outweigh any potential benefits for an attacker. This proactive stance is essential for perimeter security as it emphasizes establishing a strong first line of defense against threats.

In contrast, monitoring involves ongoing observation to detect potential security breaches and respond accordingly, which does not directly prevent incidents but rather identifies them as they occur. Investigating pertains to examining incidents post-occurence to understand their causes and impacts, and responding is the reactive aspect where actions are taken to mitigate or handle an incident after it has been detected. These strategies, while important in a comprehensive security approach, do not specifically target the prevention of incidents at the perimeter level as effectively as deterrent measures do.