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Active Directory Domain Services (AD DS) makes it possible for you to introduce advanced features into your environment by raising the ___domain or forest functional levels. To use advanced AD DS features, you must identify the operating systems that are running on the ___domain controllers in your environment.
You must also determine the best functional level for your organization based on your existing infrastructure and then raise the ___domain or forest functional level as appropriate. You can raise the functional level when all ___domain controllers in the ___domain or forest are running an appropriate version of Windows. Although raising the functional level makes it possible for you to enable new features, it also limits the versions of Windows operating systems that you can run on ___domain controllers in your environment.