You are debugging an ASP.NET web page. The page includes the following method: [WebMethod] public string GetServerString() { ... } The page also includes the following markup: <asp:ScriptManager…

You are debugging an ASP.NET web page. The page includes the following method:

[WebMethod] public string GetServerString() { ... } The page also includes the following markup:

<asp:ScriptManager ID="sm1" runat="server" /> The following JavaScript code is used to call the GetServerString method:

function GetString() { PageMethods.GetServerString(callbackMethod); } function callbackMethod(str) { ... } The AJAX calls to the GetServerString method are failing. You need to ensure that the AJAX call to the GetServerString method succeeds. Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)