Your network contains an Active Directory forest named contoso.local. You have a Microsoft 365 subscription. You plan to implement a directory synchronization solution that will use password hash synchronization. From the Microsoft 365 admin center, you successfully verify the domain name. You need to prepare the environment for the planned directory synchronization solution. What should you do first?

A. From the public DNS zone of, add a new mail exchanger (MX) record.
B. From Active Directory Domains and Trusts, add as a UPN suffix.
C. From the Microsoft 365 admin center, verify the contoso.local domain name.
D. From Active Directory Users and Computers, modify the UPN suffix for all users.

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