You are implementing an ASP.NET web page that contains a ScriptManager control.
You need to ensure that only the required MicrosoftAJAX Framework Javascript files are loaded.

A.
Set the AjaxFrameworkMode property of the ScriptManager to Enabled, and reference each javascript file
by adding a ScriptReference for each required file.

B.
Set the AjaxFrameworkMode property of the ScriptManager to Explicit, and reference each JavaScript file
by adding a ScriptReference for each required file.

C.
Set the AjaxFrameworkMode property of the ScriptManager to Disabled, and reference each JavaScript file
by adding a ScriptReference for each required file.

D.
Set the AjaxFrameworkMode property of the ScriptManager to Enabled, and manually add a reference to
each required JavaScript file to the HTML page headelement.

Explanation:
http://msdn.microsoft.com/en-us/library/system.web.ui.scriptmanager.ajaxframeworkmode.aspx