An administrator receives an error when attempting to execute a WebSphere Commerce command and decides to take the following steps to troubleshoot the problem：   Check to see if the request was processed by the WebSphere plug-in but was never received by the WebSphere Application Server  Check for Java errors from EJBs and servlets  Trace WebSphere Commerce Server subsystems and commands  Which of the following files should the administrator check to accomplish these steps？（）

• A、error.log
• B、trace.log
• C、http_plugin.log
• D、servlet.log
• E、SystemOut.log