Your network contains an Active Directory forest named adatum.com. The forest contains a single
domain. The domain contains four servers. The servers are configured as shown in the following
table.
You need to update the schema to support a domain controller that will run Windows Server 2012
R2.
On which server should you run adprep.exe?
A.
Server1
B.
DC3
C.
DC2
D.
DC1
Explanation:
We must use the Windows Server 2008 R2 Server.
Upgrade Domain Controllers to Windows Server 2012 R2 and Windows Server 2012
You can use adprep.exe on domain controllers that run 64-bit versions of Windows Server 2008 or
Windows Server 2008 R2 to upgrade to Windows Server 2012. You cannot upgrade domain
controllers that run Windows Server 2003 or 32-bit versions of Windows Server 2008. To replace
them, install domain controllers that run a later version of Windows Server in the domain, and then
remove the domain controllers that Windows Server 2003.Upgrade Domain Controllers to Windows Server 2012 R2 and Windows Server 2012, Supported inplace upgrade paths.
http://technet.microsoft.com/en-us/library/hh994618.aspx#BKMK_UpgradePaths
To upgrade schema, we need to run 2012 version of adprep. Windows Server 2012 version of adprep.exe can only run on servers that run a 64-bit version of Windows Server 2008 or later. So I go with DC3, option B.
you need to run adprep only if you are performing an in place upgrade of dc running an x64 version of server 2008/2008 r2 and if this upgraded dc will be the first windows server 2012 r2 dc in the domain
Considerations for using Adprep.exe in Windows Server 2012 R2 and Windows Server 2012
https://technet.microsoft.com/en-us/library/bce74f86-fbbf-405c-8d83-395f17a6ac8a#BKMK_WS2012
Also beginning with Windows Server 2012, there is only one 64-bit version of Adprep.exe. It can be run remotely from any server that runs a 64-bit version of Windows Server 2008 or later. The computer where you run it can be either domain-joined or in a workgroup. It includes new syntax and parameter options in order to run it remotely.