问题：

[单选]

You work as an administrator at ABC.com. The ABC.com network consists of a single domain named ABC.com. All servers in the ABC.com domain， including domain controllers， have Windows Server 2012 R2 installed.The ABC.com network has a server named ABC_SR07 that hosts two virtual machines. You use Windows Server Backup to configure scheduled backups of ABC_SR07. 
How would you ensure that all virtual machines will be saved before the backups begin？（）

A . You should configure the Router Guard settings.
B . You should configure the Port Mirroring settings.
C . You should configure the Integration Services settings.
D . You should configure a system sate backup.
E . You should configure the NIC Teaming settings.