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單項選擇題

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 
3.5. 
You create two user controls named UserCtrlA.ascx and UserCtrlB.ascx. The user controls postback to the server. 
You create a new Web page that has the following ASPX code. 

You need to ensure that the user control that is displayed meets the following requirements: ¡¤It is recreated during postback 
¡¤It retains its state. 
Which method should you add to the Web page?()

A.
B.
C.
D.

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