You have a forest that includes five domains and two trees. It contains the following domains:
Contoso.com                3 Windows Server 2003 R2 domain controllers
Support.contoso.com    3 Windows Server 2003 R2 domain controllers and 1 Windows Server 2008 R2 domain controller
Sales.contoso.com       3 Windows Server 2008 domain controllers
Litware.com                2 Windows Server 2003 domain controllers and 1 Windows 2000 Server domain controller
Partner.litware.com     2 Windows Server 2003 R2 domain controllers
What are the steps you need to promote the forest to the Windows Server 2012 functional level? 150 word minimum.