Your network contains an Active Directory forest named contoso.com. The forest contains a single domain. The domain contains two domain controllers named DC1 and DC2 that run Windows Server 2012 R2.
The domain contains a user named User1 and a global security group named Group1.
You need to modify the SAM account name of Group1.
Which cmdlet should you run?（）

Your network contains an Active Directory forest named contoso.com. The forest contains a single domain. The domain contains two domain controllers named DC1 and DC2 that run Windows Server 2012 R2.
The domain contains a user named User1 and a global security group named Group1.
You need to add a new domain controller to the domain.
You install Windows Server 2012 R2 on a new server named DC3.
Which cmdlet should you run next?（）