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The correct choice for centralized authentication, authorization, and accounting for remote access is RADIUS (Remote Authentication Dial-In User Service). RADIUS is designed to provide a scalable solution for managing user access to networks and is widely utilized by organizations to manage remote access security.

RADIUS operates by allowing a centralized server to handle requests for access from various network devices, such as routers and switches. When a user tries to gain access to the network, the request is sent to the RADIUS server, which checks the credentials against a database before granting or denying access. This process includes both authentication and authorization steps, ensuring that only authorized users can access specific resources.

Moreover, RADIUS also supports accounting capabilities that enable organizations to track user activities and the duration of their sessions, providing valuable data for network management and compliance purposes. This feature is particularly important in environments with sensitive data or strict regulatory requirements.

While other protocols such as TACACS+ and Kerberos also provide authentication, their primary focus or operational mechanics differ from RADIUS. TACACS+ offers similar functionalities but is often more used in situations that require stronger focus on command-level control for devices, while Kerberos is mainly focused on ticket-based authentication in a network, rather than centralized access management for remote connectivity. LDAP