Group Policy Result summary says DC is member of "BUILTIN\Administrators"

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http://serverfault.com – Whenever I run the Group Policy Result wizard and select a Domain Controller as the target computer, the summary shows BUILTIN\Administrators in the list of "Security Group Membership when Group Policy was applied" under Computer Configuration, as illustrated below: (Domain, user and computer name left out) Since Domain Controllers are not a member of Administrators (at least not from what I can see in ADUC), my question is simply, why? Are Domain Controllers actually members of the Administrators group, or is GPResults wrong (and why)? (HowTos)