单项选择题

A.You should run the DCPROMO command on ABC_SR07.
B.You should run the Install-ADDSDomainControllercmdlet on ABC_SR07.
C.You should upgrade one of the existing domain controllers to Windows Server 2012 R2.
D.You should configure the Integration Services settings on ABC_SR07.
E.You should configure a system sate backup of ABC_SR07.