you create a microsoft asp net application by using the framework..., Appendix,

Question:You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.
You write the following code fragment:
01 <asp:UpdatePanel ID="upnData" runat="server"
02 ChildrenAsTriggers="false" UpdateMode="Conditional">
03 <Triggers>
04 
05 </Triggers>
06 <ContentTemplate>
07 <!-- more content here -->
08 <asp:LinkButton ID="lbkLoad" runat="server" Text="Load"
09 onclick="lbkLoad_Click" />
10 <asp:Button ID="btnSubmit" runat="server" Text="Submit"
11 Width="150px" onclick="btnSubmit_Click" />
12 </ContentTemplate>
13 </asp:UpdatePanel>
14 <asp:Button ID="btnUpdate" runat="server" Text="Update"
15 Width="150px" onclick="btnUpdate_Click" />
You need to ensure that the requirements shown in the following table are met:
What should you do?

A Set the value of the ChildrenAsTriggers property in line 02 to false.
Add the following code fragment at line 04:
<asp:AsyncPostBackTrigger ControlID="btnUpdate" />
<asp:PostBackTrigger ControlID="btnSubmit" /> 
B Set the value of the ChildrenAsTriggers property in line 02 to false.
Add the following code fragment at line 04:
<asp:AsyncPostBackTrigger ControlID="btnSubmit" />
<asp:PostBackTrigger ControlID="btnUpdate" /> 
C Set the value of the ChildrenAsTriggers property in line 02 to true.
Add the following code fragment at line 04:
<asp:AsyncPostBackTrigger ControlID="btnSubmit" />
<asp:PostBackTrigger ControlID="btnUpdate" /> 
D Set the value of the ChildrenAsTriggers property in line 02 to true.
Add the following code fragment at line 04:
<asp:AsyncPostBackTrigger ControlID="btnUpdate" />
<asp:PostBackTrigger ControlID="btnSubmit" />

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A Set the value of the ChildrenAsTriggers property in line 02 to false. Add the following code fragment at line 04: <asp:AsyncPostBackTrigger ControlID="btnUpdate" /> <asp:PostBackTrigger ControlID="btnSubmit" />

B Set the value of the ChildrenAsTriggers property in line 02 to false. Add the following code fragment at line 04: <asp:AsyncPostBackTrigger ControlID="btnSubmit" /> <asp:PostBackTrigger ControlID="btnUpdate" />

C Set the value of the ChildrenAsTriggers property in line 02 to true. Add the following code fragment at line 04: <asp:AsyncPostBackTrigger ControlID="btnSubmit" /> <asp:PostBackTrigger ControlID="btnUpdate" />

D Set the value of the ChildrenAsTriggers property in line 02 to true. Add the following code fragment at line 04: <asp:AsyncPostBackTrigger ControlID="btnUpdate" /> <asp:PostBackTrigger ControlID="btnSubmit" />

D