An administrator is troubleshooting a problem on an application server, but has not determined the cause of the problem and is not able to replicate the problem. Which of the following should the administrator do prior to escalating the issue?（）
A. Gather information from users.
B. Reboot the server.
C. Apply the latest service packs to the operating system.
D. Perform a root cause analysis
参考答案：D
