单选题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 

Shut down the managed server from the WebLogic console.

Shut down the managed server using the WLST command through Node Manager.

Run kill -9 once to kill the managed server process.

Run kill -9 to kill the managed server process, and run kill -9 one more time if the managed  server is restarting.