HOTSPOT
Your network contains one Active directory forest named contoso.com. The forest contains a single domain. All
domain controllers are virtual machines that run Windows Server 2012 R2. The functional level of the domain
and the forest is Windows Server 2012 R2.
The forest contains the domain controllers configured as shown in the following table.
In the table below, select the domain controller that can be cloned by using domain controller cloning and select
the domain controller that must be online to perform domain controller cloning.
NOTE: Make only one selection in each column.
Hot Area:
Answer: 
Explanation:
http://blogs.technet.com/b/canitpro/archive/2013/06/12/step-by-step-domain-controller-cloning.aspx
There are three principal roles which prevent their host DC from being cloned.
They are,
-DHCP Server
-AD CS
-AD LDS
There are two DC FSMO roles which need to be online to facilitate a cloning. They are,
-PDC Emulator
-RID Master
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