A network technician installs Windows Server 2012 R2 Standard on a server named Server1.
A corporate policy states that all servers must run Windows Server 2012 R2 Enterprise.
You need to ensure that Server1 complies with the corporate policy.
You want to achieve this goal by using the minimum amount of administrative effort.
What should you perform?

A.
a clean installation of Windows Server 2012 R2

B.
an upgrade installation of Windows Server 2012 R2

C.
online servicing by using Dism

D.
offline servicing by using Dism

Explanation:
DISM /online /Set-Edition: ServerEnterprise/ProductKey:489J6-VHDMP-X63PK-3K798-CPX3YWindows Server
2008 R2/2012 contains a command-line utility called DISM (Deployment Image Servicing and Management
tool). This tool has many features, but one of those features is the ability to upgrade the edition of Windows in
use. Note that this process is for upgrades only and is irreversible. You cannot set a Windows image to a lower
edition. The lowest edition will not appear when you run the /Get- TargetEditions option.
If the server is running an evaluation versionof Windows Server 2012 R2 Standard or Windows Server 2012 R2
Datacenter, you can convert it to a retail version as follows:
If the server is a domain controller, you cannot convert it to a retail version. In this case, install an additional
domain controller on a server that runs a retail version and remove AD DS from the domain controller that runs
on the evaluation version. From an elevated command prompt, determine the current edition name with the
command DISM /online /Get-CurrentEdition. Make note of the edition ID, an abbreviated form of the edition
name. Then run DISM /online /Set-Edition:<edition ID> /ProductKey: XXXXXXXXXX-XXXXX-XXXXXXXXXX/
AcceptEula, providing the edition ID and a retail product key.
The server will restart twice.