单项选择题

A. The paging space is full.B. A particular filesystem ……

A user tries to telnet into a system that was previously accessible but gets the following error: "telnetd: 0403-031 fork function failed, there is not enough memory available." netstat -m shows that 0 mbuf errors have occurred. Which of the following conclusions is most appropriate to draw about this error?（）

A. The paging space is full.
B. A particular filesystem is full and cannot be allocated to memory.
C. A problem exists with telnetd.
D. The inetd daemon went down.

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