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:

<asp:ScriptManager ID="ScriptManager1" runat="server" />
 <asp:UpdatePanel ID="updateLabels" runat="server" UpdateMode="Conditional">
  <ContentTemplate>
   <asp:Label ID="Label1" runat="server" />
   <asp:Label ID="Label2" runat="server" />
   <asp:Button ID="btnSubmit" runat="server" Text="Submit"
     onclick="btnSubmit_Click" />
  </ContentTemplate>
 </asp:UpdatePanel>
<asp:Label id="Label3" runat="server" />

You need to ensure that when you click the btnSubmit Button control, each Label control value is asynchronously
updatable.
Which code segment should you use?

A protected void btnSubmit_Click(object sender, EventArgs e) {
 Label1.Text = "Label1 updated value";
 Label2.Text = "Label2 updated value";
 Label3.Text = "Label3 updated value";
} 
B protected void btnSubmit_Click(object sender, EventArgs e) {
 Label1.Text = "Label1 updated value";
 Label2.Text = "Label2 updated value";
 ScriptManager1.RegisterDataItem(Label3, "Label3 updated value");
} 
C protected void btnSubmit_Click(object sender, EventArgs e) {
 ScriptManager1.RegisterDataItem(Label1, "Label1 updated value");
 ScriptManager1.RegisterDataItem(Label2, "Label2 updated value");
 Label3.Text = "Label3 updated value";
} 
D protected void btnSubmit_Click(object sender, EventArgs e) {
 Label1.Text = "Label1 updated value";
 Label2.Text = "Label2 updated value";
 ScriptManager1.RegisterAsyncPostBackControl(Label3);
 Label3.Text = "Label3 updated value";
}

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A protected void btnSubmit_Click(object sender, EventArgs e) { Label1.Text = "Label1 updated value"; Label2.Text = "Label2 updated value"; Label3.Text = "Label3 updated value";}

B protected void btnSubmit_Click(object sender, EventArgs e) { Label1.Text = "Label1 updated value"; Label2.Text = "Label2 updated value"; ScriptManager1.RegisterDataItem(Label3, "Label3 updated value");}

C protected void btnSubmit_Click(object sender, EventArgs e) { ScriptManager1.RegisterDataItem(Label1, "Label1 updated value"); ScriptManager1.RegisterDataItem(Label2, "Label2 updated value"); Label3.Text = "Label3 updated value";}

D protected void btnSubmit_Click(object sender, EventArgs e) { Label1.Text = "Label1 updated value"; Label2.Text = "Label2 updated value"; ScriptManager1.RegisterAsyncPostBackControl(Label3); Label3.Text = "Label3 updated value";}

B

A protected void btnSubmit_Click(object sender, EventArgs e) {
Label1.Text = "Label1 updated value";
Label2.Text = "Label2 updated value";
Label3.Text = "Label3 updated value";
}

B protected void btnSubmit_Click(object sender, EventArgs e) {
Label1.Text = "Label1 updated value";
Label2.Text = "Label2 updated value";
ScriptManager1.RegisterDataItem(Label3, "Label3 updated value");
}

C protected void btnSubmit_Click(object sender, EventArgs e) {
ScriptManager1.RegisterDataItem(Label1, "Label1 updated value");
ScriptManager1.RegisterDataItem(Label2, "Label2 updated value");
Label3.Text = "Label3 updated value";
}

D protected void btnSubmit_Click(object sender, EventArgs e) {
Label1.Text = "Label1 updated value";
Label2.Text = "Label2 updated value";
ScriptManager1.RegisterAsyncPostBackControl(Label3);
Label3.Text = "Label3 updated value";
}