You have a hybrid Microsoft Exchange Server organization. All users have Microsoft 365 E5 licenses.
You plan to implement an Advanced Threat Protection (ATP) anti-phishing policy.
You need to enable mailbox intelligence for all users.
What should you do first?
A. Configure attribute filtering in Microsoft Azure Active Directory Connect (Azure AD Connect)
B. Purchase the ATP add-on
C. Select Directory extension attribute sync in Microsoft Azure Active Directory Connect (Azure AD Connect)
D. Migrate the on-premises mailboxes to Exchange Online
