/DomainLevel:{0|2|3} The domain functional level cannot be lower than the forest functional level. Default will be automatically ...

/DomainLevel:{0|2|3} The domain functional level cannot be lower than the forest functional level. Default will be automatically computed and set to the existing forest functional level or the value set for /ForestLevel Specifies the domain functional level when creating a new domain. A value of 0 specifies Windows 2000. A value of 2 specifies Windows Server 2003. A value of 3 specifies Windows Server 2008.