Describe the term 'security perimeter' in physical security.

The term 'security perimeter' in physical security refers to the defined boundary that protects an asset from unauthorized access. This concept is essential as it establishes the limits of a secured area, ensuring that only authorized personnel and vehicles can enter. The security perimeter can be established through various means, including fences, walls, gates, or even technological solutions like surveillance systems and access control devices.

By clearly defining a security perimeter, organizations can effectively monitor and control access to their assets, reduce the risk of theft or vandalism, and create a controlled environment for operations. This focus on boundaries is crucial for maintaining the integrity and safety of the assets within.

Other options, while related to security, do not capture the essence of what a security perimeter denotes. Technical controls are tools used within a perimeter but do not define it. A type of physical barrier only highlights just one method of securing a perimeter rather than encompassing the complete definition. Regulatory compliance measures pertain to adherence to laws and guidelines, which may involve perimeter security but are not specifically about its definition as a protective boundary.