What must each employee possess to differentiate themselves from others?

The correct choice emphasizes the importance of access credentials in an electronic access control system. Access credentials are unique identifiers that grant individuals permission to enter certain areas or access specific resources within an organization. This could include key cards, biometric scans, or passwords that are tailored to each employee’s level of access.

Having an appropriate access credential is crucial for maintaining security, as it helps to ensure that only authorized personnel can enter restricted areas or use certain systems. These credentials not only differentiate individual employees but also play a significant role in tracking and logging who accesses what areas, thereby enhancing overall security management.

While public identification badges can also serve to identify employees, they typically do not indicate the level of access or permissions that an individual holds. Similarly, a company email, while essential for communication, does not inherently provide security control or access differentiation. Security clearance refers to a specific acknowledgment for individuals who handle sensitive information but is not universally required for all employees. Access credentials, on the other hand, are fundamental in establishing controlled access within an organization.