Your network contains an Active Directory domain. All domain controllers run Windows Server  2008. The functional level of the domain is Windows Server 2003. All client computers run  Windows 7.   You install Windows Server 2008 R2 on a server named Server1. You need to perform an offline  domain join of Server1.     Which two actions should you perform（）

• A、From Server1， run djoin.exe.
• B、From Server1， run netdom.exe.
• C、From a Windows 7 computer， run djoin.exe.
• D、Upgrade one domain controller to Windows Server 2008 R2.
• E、Raise the functional level of the domain to Windows Server 2008.