Option 1: Use a Planned Domain
When the domain design for a forest indicates a single domain, then this single domain is the forest root domain. This one domain will host all users, groups, computers, and the forest root groups.
If multiple domains exist in the design, one of the domains can be selected to be the forest root domain in addition to managing the users and resources of the domain. The selected domain will define the forest namespace and will need to be the first domain deployed in the environment. Although it will also manage users and resources, it will always maintain its unique status as the domain containing the Enterprise Admins and Schema Admins groups.
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