The administrator has just installed a new memory module into the server. Now， the server is not showing the new memory. Which of the following should the administrator perform FIRST？（）

A. Follow the pre-installation plan and procedures.按照预先安装计划和程序。
B. Review the system logs to check for errors.
C. Notify all users that the old system will be taken offline.
D. Apply all security updates to the system.

A.ZFS
B.VMFS
C.PXE
D.PBX

A. Identify which systems are the most critical and bring them up by level of importance.
B. Retrieve the latest backup tapes for immediate system restore using the GFS rotation.
C. Identify the least critical systems and then power those systems on first.
D. Determine the cause of the power outage and install UPS systems to prevent its reoccurrence.