Which property should you use?

You have a Microsoft Office SharePoint Server 2007 site. You upgrade the site to SharePoint
Server 2010. You need to create a Feature that prevents site collection administrators from
upgrading the user interface of the site to SharePoint Server 2010. Which property should you
use?

A.
AdministrationSiteType

B.
AllowMasterPageEditing

C.
AllowDesigner

D.
UIVersionConfigurationEnabled