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单项选择题

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create an AJAX-enabled Web form by using the following code fragment:  
<asp:ScriptManager ID="scrMgr" runat="server" />  
<asp:UpdatePanel runat="server" ID="updFirstPanel" UpdateMode="Conditional">  
<ContentTemplate>  
<asp:TextBox runat="server" ID="txtInfo" />  
<asp:Button runat="server" ID="btnSubmit" Text="Submit" /> 
 </ContentTemplate>  
</asp:UpdatePanel>  
<asp:UpdatePanel runat="server" ID="updSecondPanel" UpdateMode="Conditional">  <ContentTemplate> ... 
</ContentTemplate>  
</asp:UpdatePanel>   
When the updFirstPanel UpdatePanel control is updated, a dynamic client script is registered. You write the following code segment in the code-behind file of the Web form:  
01 protected void Page_Load(object sender, EventArgs e)  
02 {  
03   if(IsPostBack)  
04   {  
05     string generatedScript = ScriptGenerator.GenerateScript();  
06 ► 
07   }  
08 }   
You need to ensure that the client-script code is registered only when an asynchronous postback is issued on the updFirstPanel UpdatePanel control. 
Which code segment should you insert at line 06? ()

A.A
B.B
C.C
D.D

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