Which advantage is provided by using Active Directory as an external identity source?

Which advantage is provided by using Active Directory as an external identity source?
A . It supports SAML for single sign-on.
B . It uses EAP chaining with EAP-FAST to authenticate users and computers.
C . It supports two factor-authentication using a PIN and a token.
D . It uses EAP chaining with EAP-TLS to authentication users and computers.

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Answer: A