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. （Line numbers are included for reference only.）  01  02 function pageLoad（）  03 {  04 var pageMgr =  05 Sys.WebForms.PageRequestManager.getInstance（）；  06  07 }  08  09 function errorHandler（sender， args）  10 {  11  12 }  | English | Chinese | Japan | Korean | - 146 - Test Information Co.， Ltd. All rights reserved. 13   You need to ensure that the application performs the following tasks： ¡；¤Use a common clien-script function named errorHandler. ¡；¤Update a Label control that has an ID named lblEror 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