You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You write the following code segment to create a client-script function：  
01 function updateLabelControl（labelId， newText） { 
02 ► var label = $find（labelId）； 
03 ► label.innerHTML = newText；  
04 }  
The client script function uses ASP.NET AJAX and updates the text of any Label control in the Web form. 
When you test the client script function， you discover that the Label controls are not updated. You receive the following JavaScript error message in the browser： "’null’ is null or not an object." You need to resolve the error.
What should you do？（）

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You add the following code fragment to the Web.config file of the application：  
01 <healthMonitoring>  
02   <providers>  
03     <add name="EventLogProvider"  
04       type="System.Web.Management.EventLogWebEventProvider  
05     />  
06     <add name="WmiWebEventProvider"  
07       type="System.Web.Management.WmiWebEventProvider  
08     />  
09   </providers>  
10   <eventMappings>  
11 ► 
12   </eventMappings>  
13   <rules>  
14     <add name="Security Rule" eventName="Security Event"  
15       provider="WmiWebEventProvider" />  
16     <add name="AppError Rule" eventName="AppError Event" 
17       provider="EventLogProvider" />  
18   </rules>  
19 </healthMonitoring>  
You need to configure Web Events to meet the following requirements： 
Security-related Web Events are mapped to Microsoft Windows Management Instrumentation （WMI） events. 
Web Events caused by problems with configuration or application code are logged into the Windows Application Event Log.  
Which code fragment should you insert at line 11？（）

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You plan to monitor the execution of the application at daily intervals. 
You need to modify the application configuration to enable WebEvent monitoring. 
What should you do？（）

You create a Microsoft ASP.NET Web application by using the Microsoft .NET Framework version 3.5. 
When you review the application performance counters， you discover that there is an unexpected increase in the value of the Application Restarts counter. You need to identify the reasons for this increase. 
What are three possible reasons that could cause this increase？（）