What should you do?

You have a Microsoft Exchange Server 2016 hybrid deployment.

You plan to migrate mailboxes from the on-premises Exchange organization to Exchange Online.

You have the appropriate permissions to perform the mailbox migrations.

You need to prepare the environment for the planned migration.

What should you do?
A . Disable Microsoft Outlook for the web.
B . Install the Hybrid Agent.
C . Run Get-MigrationBatch -Identity "MyMigrationBatch".
D . Enable the MRSProxy service on an on-premises Exchange server.

Answer: D

Explanation:

Mailbox replication service (MRS) proxy is used for cross forest mailbox move and remote move migration between on premise exchange and exchange online (Office 365)

Reference: https://docs.microsoft.com/en-us/Exchange/hybrid-deployment/move-mailboxes