Which control is NOT useful for managing visitors to a secure facility?

The control that is not particularly effective for managing visitors in a secure facility is the fence. While a fence can provide a physical barrier to deter unauthorized access and secure the perimeter of the facility, it does not directly manage or monitor the movements of individuals within the facility. Fences are more about preventing access in the first place rather than controlling or managing visitors once they have entered the premises.

In contrast, the other options serve key roles in visitor management. A sign-in sheet or tracking log actively records who enters and exits the facility, providing accountability and an easy way to monitor visitors. Badges that differ from employee badges help in easily identifying individuals who are not part of the regular staff, enhancing visibility and security. A receptionist plays a critical role in greeting visitors, verifying their identity, and directing them appropriately, which adds another layer of security by ensuring that visitors are accounted for and managed properly while on site.