You are implementing an ASP.NET web page that contains a ScriptManager control. You need to
ensure that only the required Microsoft AJAX 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 head element.

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