单项选择题

A.The files have grown to over eight gigabytes in sizeB……

Companycom has been performing scheduled backups of their data to tape using "tar" in a script for over one year with no problems. Recently, the tar command is returning a non zero return code during the backup phase, causing the script to fail.
What is the primary cause of this problem?（）

A.The files have grown to over eight gigabytes in size
B.The file systems are corrupt, and fsck should be run
C.The tape block size has been changed from the default
D.The user’s limit has been changed to less than eight gigabytes

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