You need to register the Microsoft Azure Backup Agent o…

You have a server named Server1 that runs Windows Server 2012 R2.
You have a subscription to Windows Azure.
You need to register the Microsoft Azure Backup Agent on Server1.
What should you do first?

A.
Create a Site recovery vault.

B.
Install the Microsoft System Center 2012 Data Protection Manager (DPM) agent.

C.
Configure a passphrase for the Azure Backup Agent.

D.
Create a backup vault.

Explanation:
https://blogs.technet.microsoft.com/canitpro/2013/09/18/step-by-step-setup-the-online-backup-service-forwindows-server-2012/