You have a Microsoft Office SharePoint Server 2007 Service Pack 2 (SP2) server farm.

You upgrade the server farm to SharePoint server 2010.

You open a SharePoint site and discover that you cannot select the Visual Upgrade option.

You need to ensure that you can perform a visual upgrade of the SharePoint site.

What should you do?

A.
Run the upgrade-spcontentdatabase cmdlet.

B.
Run psconfig.exe and specify the -cmd parameter.

C.
Run stsadm.exe and specify the setproperty operation.

D.
Run stsadm.exe and specify the preupgradecheck operation.

Explanation:
When you upgrade, either by using in-place upgrade or by using the database attach upgrade method, you can choose to use Visual Upgrade.
During an in-place upgrade, you make the choice to use Visual Upgrade as a step in the SharePoint Products Configuration Wizard. The visual upgrade feature is not available in the SharePoint Products Configuration Wizard if you are performing an upgrade on a stand-alone server with built-in database. However, the Visual Upgrade feature is available in this case from the Psconfig command-line tool. You can then use the syntax: psconfig.exe -cmd upgrade [preserveolduserexperience <true|false>].

During a database attach upgrade, the choice to update to the new user experience or stay in the old user experience is accomplished by using either:

* The Updateuserexperience parameter of the Mount-SPContentDatabase Windows PowerShell cmdlet.
* The preserveolduserexperience parameter of the addcontentdatabase Stsadm operation.

Upgrading to Microsoft SharePoint Server 2010
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=3837