A user is reporting that access to a file server is much slower than it has been. The system administrator completes a test of the server using a system monitoring tool and compares it to the previously taken baseline. The comparison shows that there are no significant changes in the use of system resources. Which of the following actions should be taken to resolve this user problem?（）

• A、Add additional RAM to the user PC
• B、Troubleshoot the user PC
• C、Add additional RAM to the server
• D、Add additional hard drive space to the server