You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You plan to deploy the application to a test server.  You need to ensure that during the initial request to the application， the code-behind files for the Web pages are compiled. You also need to optimize the performance of the application. Which code fragment should you add to the Web.config file？ （）

• A、A
• B、B
• C、C
• D、D