You work as an administrator at ABC.com. The ABC.com network consists of a single domain named ABC.com. All domain controllers on the ABC.com domain have Windows Server 2008 R2 installed. The ABC.com network has a member server named ABC_SR07 that has Windows Server 2012 R2 installed.You are required to promote ABC_SR07 to a domain controller. You log on to SERVER07 and insert the installation disk. What would be your next step？（）

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.