What should you first?

Your network contains an Active Directory forest. The forest functional label is Windows Server 2012 R2. The forest contains a Microsoft Exchange Server 2019 organization. Users access their mailbox by using Microsoft Outlook 2016.

You purchase a Microsoft 365 E5 subscription.

You plan to move 20 mailboxes to Exchange Online.

From Exchange Online, you attempt to perform a remote move migration. When you are prompted to select the users, you discover that there are no users to select. You need to ensure that you can migrate the users to Exchange Online by using a remote move migration.

You need to ensure that you can migrate the users to Exchange Online by using a remote move migration.

What should you first?
A . Create a new certificate.
B . Upgrade the forest functional level.
C . Prepare the Active Directory schema.
D . Implement Active Directory synchronization.