You are implementing an ASP.NET page that includes a text box.
You need to validate values that are typed by users to ensure that only numeric values are submitted.
Which control markup should you use?
A. <asp:TextBox ID="txt1" runat="server" CausesValidation="true" ValidationGroup= "Numeric" />
B. <asp:TextBox ID="txt1" runat="server" EnableClientScript="true" ValidationGroup= "Numeric" />
C. <asp:TextBox ID="txt1" runat="server" />
<asp:RegularExpressionValidator ID="val1" runat="server" ControlToValidate="txt1" ValidationExpression="[0-9]*" ErrorMessage="Invalid input value" />
D. <asp:TextBox ID="txt1" runat="server" />
<asp:RegularExpressionValidator ID="val1" EnableClientScript="true" ControlToValidate="txt1" ValidationExpression="[0-9]*" ErrorMessage="Invalid input value" />
