Which of these are examples of an access control system? Select all that apply.TACACS+OAuthOpenIDRADIUS

All of the options you provided are examples of an access control system. Here's a brief explanation of each:

1. TACACS+ (Terminal Access Controller Access-Control System Plus) - This is a protocol that handles authentication, authorization, and accounting (AAA) services. It is commonly used in enterprise-level networks to provide centralized control over network access.

2. OAuth (Open Authorization) - This is an open standard for access delegation. It's commonly used as a way for internet users to grant websites or applications access to their information on other websites but without giving them the passwords.

3. OpenID - This is an open standard and decentralized authentication protocol. It allows users to be authenticated by certain co-operating sites (known as Relying Parties or RP) using a third party service.

4. RADIUS (Remote Authentication Dial-In User Service) - This is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service.

So, TACACS+, OAuth, OpenID, and RADIUS are all examples of access control systems.