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单项选择题Which of the following problems has occurred when a menu appears and prompts the user to "copy a dump to external media?（）

A、 The external dump device is full. 

B、 The dump device was set to /dev/hd7 before the dump happened. 

C、 The boot failed while copying the dump from paging space to a file. 

D、 The dump device was not set to a paging device before the dump happened.

  • C

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