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” />