Which of the following ensures the MOST secure access to a server room?

ID card readers rely on physical cards which can be lost, stolen, or duplicated, making them less secure than methods based on inherent user characteristics.

Server rack doors secure individual equipment within a server room but do not control access to the room itself, offering no perimeter security for the facility.

Biometric devices provide the strongest form of physical access control by authenticating individuals based on unique physiological traits, such as fingerprints or iris patterns. These characteristics are extremely difficult to forge or steal, ensuring that only pre-approved personnel can gain access and significantly enhancing security.

Locked doors provide a basic physical barrier but can be circumvented through lock picking, unauthorized key duplication, or simple human error, offering less robust security than advanced access control systems.