HOTSPOT
Your network contains an Active Directory domain named contoso.com. The domain
contains domain controllers that run either Windows Server 2003, Windows Server 2008 R2,
or Windows Server 2012 R2.
You plan to implement a new Active Directory forest. The new forest will be used for testing
and will be isolated from the production network.
In the test network, you deploy a server named Server1 that runs Windows Server 2012 R2.
You need to configure Server1 as a new domain controller in a new forest named
contoso.test.
The solution must meet the following requirements:
The functional level of the forest and of the domain must be the same as that of
contoso.com.
Server1 must provide name resolution services for contoso.test.
What should you do?
To answer, configure the appropriate options in the answer area.
Answer: 
Explanation:
Forest select 2003
Domain select 2003
Remember to tick DNS
Forest functional level: Windows Server 2003
Domain functional level: Windows Server 2003
Check Domain Name System (DNS) server checkbox.
Thanks
Why 2003?
https://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels
why 2003?
https://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels