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Access control systems, such as ID badges, are considered one of the most common physical security measures because they specifically regulate who can enter a particular area and help to ensure that only authorized personnel have access. These systems typically involve issuing identification cards that are scanned or presented at entry points, effectively serving as a barrier to prevent unauthorized access.

The use of ID badges contributes to a layered security approach. Not only do they authenticate identity, but they also can be integrated with other security technologies such as key card readers and biometric scanners, enhancing overall safety in a facility. These measures are tangible, meaning they can physically control access to buildings and critical areas, making them a key element in physical security strategies.

Meanwhile, other options like security policies and online training sessions focus more on procedural aspects of security management rather than physical barriers. Guard dog training, while a valid security approach, is not as widely implemented or recognized as a standard measure compared to access control systems. Therefore, access control systems represent a fundamental component of physical security.