单项选择题

Whichofthefollowingproblemshasoccurredwhenamenuappearsandpromptstheuserto'copyadumptoexternalmedia?（）

A.Theexternaldumpdeviceisfull.
B.Thedumpdevicewassetto/dev/hd7beforethedumphappened.
C.Thebootfailedwhilecopyingthedumpfrompagingspacetoafile.
D.Thedumpdevicewasnotsettoapagingdevicebeforethedumphappened.

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