You work as a Web Developer at Certkiller.com. You are in the process of creating a mobile Webapplication. You use Microsoft ASP.NET 3.5 to create the Web application. 
In an assembly named MobileUser the following code exists： 
namespace Certkiller.MobileUser { 
public class Capabilities { 
public static bool IsEnhancedDevice（MobileCapabilities capabilities， string optional） { 
return （capabilities["AJAX"] == Boolean.TrueString && 
capabilities["Silverlight"] == Boolean.TrueString）； 
} 
} 
} 
The following code is contained on a page in the Web application： 
MobileCapabilities capabilities = （MobileCapabilities）Request.Browser； 
bool isEnhancedDevice = capabilities.HasCapability（"SilverlightAndAjax"， null） 
You have to make sure that the code calls the IsEnhancedDevice method of the Capabilities class.You configure the Web.config file to accomplish this.
What should you do？（）

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