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”;
}