you have an updatepanel control defined on a page need to..., Client-Side Scripting, ASP.NET

Question:You have an UpdatePanel control defined on a page. You need to indicate that a specified Button control outside of the UpdatePanel should cause the UpdatePanel to execute an update. What steps should you take?

A Set the AsyncPostBackTrigger attribute of the UpdatePanel to the ID of the Button control. 
B Set the AsyncPostBackTrigger attribute of the Button control to the ID of the UpdatePanel. 
C Add a Trigger control to the AsyncPostBackTriggers section of the UpdatePanel. Set the ControlID attribute of the Trigger control to the ID of the Button control. 
D Add an AsyncPostBackTrigger control to the Triggers section of the UpdatePanel. Set the ControlID attribute of the AsyncPostBackTrigger control to the ID of the Button
control.

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Question:You have an UpdatePanel control defined on a page. You need to indicate that a specified Button control outside of the UpdatePanel should cause the UpdatePanel to execute an update. What steps should you take?

A Set the AsyncPostBackTrigger attribute of the UpdatePanel to the ID of the Button control.

B Set the AsyncPostBackTrigger attribute of the Button control to the ID of the UpdatePanel.

C Add a Trigger control to the AsyncPostBackTriggers section of the UpdatePanel. Set the ControlID attribute of the Trigger control to the ID of the Button control.

D Add an AsyncPostBackTrigger control to the Triggers section of the UpdatePanel. Set the ControlID attribute of the AsyncPostBackTrigger control to the ID of the Button control.

D