Which option is a prerequisite for selecting a third -party IdP for Cisco Collaboration?

Security Assertion Markup Language (SAML) is a widely used standard for single sign-on (SSO) and is a prerequisite for using a third-party identity provider (IdP) with Cisco Collaboration applications. While other options might be related to authentication protocols, SAML 2.0 is the current standard supported by Cisco for integration with third-party IdPs.