RADIUS is the most correct answer. Single sign-on relies on an authenticating body, typically a server, to grant access to remote access requests. The server may query a database or database server (LDAP) to verify the credentials.
All other answers have no impact on a user's capacity to use single sign-on, and are incorrect.
RADIUS and TACACS+ are authentication protocols, not authentication methods, and are often involved with single sign-on (SSO).
The purpose of a single sign-on (SSO) is to give users access to all the applications and systems that they need when they log in.
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Takoyaki
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