Your network contains an Active Directory domain named contoso.com. All servers run Windows Server 2012
R2. The functional level of both the domain and the forest is Windows Server 2008 R2.
The domain contains a domain-based Distributed File System (DFS) namespace that is configured as shown in
the exhibit. (Click the Exhibit button.)

You need to enable access-based enumeration on the DFS namespace.
What should you do first?

A.
Raise the domain functional level.

B.
Raise the forest functional level.

C.
Install the File Server Resource Manager role service on Server3 and Server5.

D.
Delete and recreate the namespace.

Explanation:

Access-based enumeration is only supported on a Domain-based Namespace in Windows Server 2008 Mode.
This type of Namespace requires a minimum Windows Server 2003 forest functional level and a minimum
Windows Server 2008 domain functional level.
The exhibit indicates that the current namespace is a Domain-based Namespace in Windows Server 2000
Mode. To migrate a domain-based namespace from Windows 2000 Server mode to Windows Server 2008
mode, you must export the namespace to a file, delete the namespace, recreate it in Windows Server 2008
mode, and then import the namespace settings.
Ref: http://msdn.microsoft.com/en-us/library/cc770287.aspx
http://msdn.microsoft.com/en-us/library/cc753875.aspx