A highly available WebLogic cluster in UNIX is configured for automatic server migration. Node Managed is configured on both machines to start managed servers. How should you simulate a managed server failure to test whether automatic server migration is working?（）

• A、Shut down the managed server from the WebLogic console.
• B、Shut down the managed server using the WLST command through Node Manager.
• C、Run "kill -9" once to kill the managed server process.
• D、Run "kill -9" to kill the managed server process, and run "kill -9" one more time if the managed  server is restarting.