What defines a man-trap style portal?

A man-trap style portal is specifically designed to control access by allowing only one door to be opened at a time, thereby significantly enhancing security. This configuration is particularly useful in environments where sensitive information or assets are present, as it prevents unauthorized individuals from easily entering or moving through the portal.

The operation of a man-trap involves an enclosed space with two doors: one leads to the unsecured area, while the other leads to the secured area. When someone enters the man-trap, they must first close the door behind them before the next door can be opened. This one-at-a-time entry feature prevents tailgating, where an unauthorized individual could attempt to enter through the second door after the authorized person.

Other answer choices, while they address various key features in access control systems, do not adequately define what a man-trap is. For example, allowing multiple entries would contradict the very purpose of a man-trap, which is to create a controlled and secure access point. Similarly, biometric access or requiring a secondary verification step may be used in conjunction with a man-trap system but are not defining characteristics of the portal itself. Thus, the accurate defining feature of a man-trap style portal is the restriction that only one door can be