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- 单项选择题 The df command indicates that a filesystem is full， however， the du command indicates that not all space is allocated. How would the system administrator isolate the discrepancy（）
A、Use the fuser command to identify deleted but open files.
B、Use the ipcs command to view orphan shared memory segments.
C、Use the defrag command to determine if the filesystem is fragmented.
D、Use the topas command to identify processes using the most system resources.
- A
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