Which of these is not one of the key elements of access control?

Access control is a fundamental aspect of cybersecurity that is concerned with regulating who or what can access or use resources in a computing environment. The key elements of access control focus primarily on identifying users, validating their identity, and granting appropriate permissions.

Account administration involves the management of user accounts and profiles, which is essential for ensuring that access rights are assigned correctly and maintained throughout the lifecycle of the account. Authentication is the process of verifying the identity of users who are attempting to access a system, commonly through methods such as passwords or biometric scans. Authorization involves granting or denying permission to specific resources or actions based on the authenticated user's privileges.

In this context, network security, while an important aspect of overall cybersecurity, does not directly relate to the core elements of access control. Network security generally pertains to protecting the integrity, confidentiality, and availability of data and resources as they move across networks, rather than the specific mechanisms of managing user access and permissions within a system. Thus, it stands out as not being one of the key elements of access control.