單項選擇題

A user calls the system administrator and states that they can no longer access the file server they had been working on all morning. To trouble shoot this problem， 
which step should the administrator take FIRST？（）

A. Reboot the file server.
B. Ask the user what they were doing when they noticed the problem.
C. Ask the user to reboot their PC.
D. Ask the user to ping the default gateway and report the response times back to the administrator.

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