You use Microsoft .NET Framework v3.5 to create a Microsoft ASP.NET application forCertkiller.com.  The code segment below is written to create a client-script function. （The line numbers is includedfor reference purposes） 1 function updateLabelControl（labelId， newText） { 2 var label = $find（labelId）； 3 label.innerHTML = newText； 4 }  This newly created script will make use of ASP.NET AJAX. The script will also update the text ofall the Label controls in the web form. It has come to your attention that the Label controls are notupdated when the client script function is tested. However， you receive the"’null’ is null or not anobject" JavaScript error message in the browser.  What should you do？（）

• A、A
• B、B
• C、C
• D、D