Which Windows PowerShell cmdlets should you run on each server?

You have 30 servers that run Windows Server 2012 R2.
All of the servers are backed up daily by using Windows Azure Backup.
You need to perform an immediate backup of all the servers to Windows Azure Backup.
Which Windows PowerShell cmdlets should you run on each server?

A.
Get-OBPolicy | Start-OBBackup

B.
Get-WBPolicy | Start-WBBackup

C.
Start-OBRegistration | Start-OBBackup

D.
Get-WBBackupTarget | Start-WBBackup

Explanation:
A) starts a backup job using a policy
B) Registers the current computer to Windows Azure Backup.
C) Not using Azure
D) Not using Azure
http://technet.microsoft.com/en-us/library/hh770406(v=wps.620).aspx
http://technet.microsoft.com/en-us/library/hh770426.aspx
http://technet.microsoft.com/en-us/library/hh770398.aspx