You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a Web form by using ASP.NET AJAX.  You write the following client-script code fragment to handle the exceptions thrown from asynchronous postbacks：   01    02   function pageLoad（）   03   {   04     var pageMgr =  05       Sys.WebForms.PageRequestManager.getInstance（）；   06 ►  07   }   08   09   function errorHandler（sender， args）   10   {   11 ►  12   }   13  You need to ensure that the application performs the following tasks：  use a common client-script function named errorHandler.  udpdate a Label control that has an ID named lblError with the error message.  prevent the browser from displaying any message box or Javascript error.   What should you do？（）

• A、A
• B、B
• C、C
• D、D