单项选择题
When a user tries to log into the system, the following error occurs: "3004-004. You must "exec" login from the lowest login Shell". Which of the following procedures should be performed next to determine the cause of the problem?（）
A. Reboot the system.
B. Increase the number of ptys.
C. Increase number of licenses.
D. Run df -k to check for full filesystems.
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