You are the systems administrator of a large organization that has recently implemented Windows Server
2008 R2.
You have a few remote sitesthat do not have very tight security.
Youhave decided to implement read-only domain controllers (RODC).
What forest functional levelsdoes the network need for you to do the install?
(Choose Three)

A.
Windows 2000 Mixed

B.
Windows 2008 R2

C.
Windows 2003

D.
Windows 2008

Explanation:
http://technet.microsoft.com/en-us/library/cc731243%28v=ws.10%29.aspx
Prerequisites for Deploying an RODC
Ensure that the forest functional level is Windows Server 2003 or higher.
..
Deploy at least one writable domain controller running Windows Server 2008 or Windows Server 2008 R2 in
the same domain as the RODC and ensure that the writable domain controller is also a DNS server that has
registered a name server (NS) resource record for the relevant DNS zone. An RODC must replicate domain
updates from a writable domain controller running Windows Server 2008 or Windows Server 2008 R2.