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?（）
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