Which two are prerequisites for external authentication providers?

Which two are prerequisites for external authentication providers?
A . Delete all users from the system.
B . Configure two-factor authentication for all your users.
C . Set up Azure Active Directory to send events to the QRadar log collector.
D . Configure the authentication server before you configure authentication in QRadar.
E . Ensure that all users have appropriate user accounts and roles to allow authentication with the vendor servers.

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Answer: DE