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The correct answer is D.

OBJ-2.4: OAuth 2 is explicitly designed to authorize claims and not to authenticate users. The implementation details for fields and attributes within tokens are not defined. Open ID Connect (OIDC) is an authentication protocol that can be implemented as special types of OAuth flows with precisely defined token fields. Security Assertion Markup Language (SAML) is an open standard for exchanging authentication and authorization data between parties, in particular, between an identity provider and a service provider. SAML is an XML-based markup language for security assertions. Active Directory Federation Services (ADFS) is a software component developed by Microsoft that can run on Windows Server operating systems to provide users with single sign-on access to systems and applications located across organizational boundaries. Kerberos is a computer network authentication protocol that works based on tickets to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner.

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