You work as an application developer at Certkiller .com. You have recently created and deployed an application using the .NET 1.1 CLR to all Certkiller .com users. After a Certkiller .com administrator updates all user computers with the .NET 2.0 CLR， you run preliminary tests and find that the application you created using the .NET 1.1 CLR is not compatible with the .NET 2.0 CLR.  You need to ensure that the application can be run with the .NET 1.1 CLR. What should you do？（）

• A、A
• B、B
• C、C
• D、D