You work as an application developer at Certkiller .com. You have recently created a multithreaded application to manage Certkiller .com’s inventory system.  The fulfillment task has to be executed on a regular basis， while other tasks are performed in the application. The task does not need any input to start.  You are required to create and start the fulfillment thread using the appropriate code.What code should you use？（）

• A、A
• B、B
• C、C
• D、D