You have one Web application that contains several SharePoint site collections. You need to
create a Feature that adds a custom button to the Documents tab on the Ribbon of one site
collection only. What should you do?

A.
Create a new Feature. In a new <CommandUIDefinition> node, specify the location of
Ribbon.Tabs._children.

B.
Create a new Feature. In a new <CommandUIDefinition> node, specify the location of
Ribbon.Documents.Manage.Controls._children.

C.
Modify the CMDUI.xml file. In a new <CommandUIDefinition> node, specify the location of
Ribbon.Tabs._children.

D.
Modify the CMDUI.xml file. In a new <CommandUIDefinition> node, specify the location of
Ribbon.Documents.Manage.Controls._children.

Explanation: