You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. <br /> When you access the application in a Web browser, you receive the following error message: "Service Unavailable". <br /> You need to access the application successfully. <br /> What should you do?()
A、Start Microsoft IIS 6.0.
B、Start the Application pool.
C、Set the .NET Framework version.
D、Add the Web.config file for the application.