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