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单项选择题 You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a login Web form by using the following code fragment：                When a user clicks the btnLogin Button control， the login（） client-side script is called to authenticate the user. The credentials provided in the TextBox controls are used to call the client-side script.  You also add the following client-script code fragment in the Web form：   01    02   function login（） {   03     var username = $get（’txtUser’）.value；   04     var password = $get（’txtPassword’）.value；   05   06 ►   // authentication logic.  07   }   08   function onLoginCompleted（validCredentials， userContext，   09     methodName）   10   {   11     // notify user on authentication result.  12   }   13   14   function onLoginFailed（error， userContext， methodName）   15   {   16     // notify user on authentication exception.  17   }   18    The ASP.NET application is configured to use Forms Authentication. The ASP.NET AJAX authentication service is activated in the Web.config file.  You need to ensure that the following workflow is maintained：  on successful authentication， the onLoginCompleted client-script function is called to notify the user.  on failure of authentication， the onLoginFailed client-script function is called to display an error message.   Which code segment should you insert at line 06？（）

A、A

B、B

C、C

D、D

  • A

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