Describe what a perimeter check involves.

A perimeter check involves inspecting the boundaries of a property to deter unauthorized entry. This process is crucial for maintaining security, as it helps identify potential vulnerabilities in the physical barriers that protect the property, such as fences, gates, and entrances. By regularly conducting perimeter checks, security personnel can ensure that these boundaries are intact and secure, preventing unauthorized access and protecting both people and property.

In contrast to the other options, conducting interviews with employees, arranging security training sessions, and setting up alarms inside the property serve different purposes. Interviews might help identify potential security threats from personnel but do not directly address physical security measures. Training sessions enhance the skills and knowledge of security staff but don't involve the direct observation of property boundaries. Indoor alarm setups also focus on responding to incidents rather than proactively checking the perimeter to prevent entry. Thus, inspecting the boundaries is the key action that defines a perimeter check.