You are the administrator of a Windows Server 2003 computer named Server1. Newly hired employees recently started storing files on Server1. Now users report that Server1 is responding much slower than it did before the additional users were added. You suspect the disk subsystem needs to be upgraded to accommodate the additional user load. You need to confirm whether the disk subsystem on Server1 needs to be upgraded. What should you do?（）

• A、Configure a Performance Logs and Alerts alert on the %Free Space counter.
• B、Use Device Manager to populate volume settings and examine the properties of the disk drives on Server1
• C、Use Event Viewer to examine the system logs and search the system logs for events generated by the disk event source.
• D、Use System Monitor to monitor counters based on the PhysicalDisk object.