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 <script type="text/javascript"> 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 </script> 
You need to ensure that the application performs the following tasks： &iexcl；¤Use a common clien-script function named errorHandler. &iexcl；¤Update a Label control that has an ID named lblEror with the error message. &iexcl；¤Prevent the browser from displaying any message box or Javascript error 
What should you do？ （）

A.A
B.B
C.C
D.D