You work as a Web Developer at Certkiller.com. You are in the process of creating a Webapplication using Microsoft ASP.NET 3.5.  In order toimplement partial rendering on a page you add the following markup：                              You only want the content in the updatePanel2 control to be updated when the Button controlnamed _btnUpd is clicked. You need to configure the page to accomplish this goal of thecompany.  What should you do？（）

• A、You should consider replacing AsyncPostBackTrigger with PostBackTrigger.
• B、You should consider setting the UpdateMode property of updatePanel2 to Conditional.
• C、You should consider setting the ChildrenAsTriggers property of updatePanel1 to false.
• D、You should consider setting the ChildrenAsTriggers property of updatePanel2 to false.
• E、You should consider setting the UpdateMode property of updatePanel1 to Conditional.
• F、You should consider setting the UpdateMode property of updatePanel2 to Always.