A customer indicates that a system is experiencing printing problems. After checking the system, and successfully printing, no problem has been found.  Which of the following procedures should be performed next to further clarify the problem?（）

A. Reboot the system.
B. Check the file system sizes.
C. Have the customer repeat the task to recreate the problem.
D. Inform the customer that no problems were found， and to call back if the problem reoccurs.