Which code segment should you add to the Custom Action node of the Elements.xml file?

You plan to add a custom tab to the Ribbon in a SharePoint Web application.

You create a custom Feature that contains an Elements.xml file.

You need to ensure that the custom tab only appears in the document libraries of the Web application.

Which code segment should you add to the Custom Action node of the Elements.xml file?

A.
Location=”DocumentLibrary”

B.
RegistrationId=”101″

C.
RegistrationType=”List”

D.
ShowInLists=”false”

Explanation:
MNEMONIC RULE: “document libraries 101”

SharePoint: RegistrationId List Template Type IDs
http://techtrainingnotes.blogspot.com/2008/01/sharepoint-registrationid-list-template.html

Work with the SharePoint 2010 Ribbon User Interface
http://msdn.microsoft.com/en-us/library/ff630938.aspx