A link to a JavaScript library that can be used in the Visualforce page. When specified, this
component injects a script reference into the head element of the generated HTML page.
For performance reasons, you may simply want to use a JavaScript tag before your closing
<apex:page> tag, rather than this component.

A.
apex:includeScript

B.
apex:outputField

C.
apex:attribute

D.
apex:component