单项选择题

A tape library can be defined as which of the following？（）

A. A way to catalog tapes after a tape backup to easily identify and retrieve data.
B. A modular tape backup system containing multiple drives， tapes， and connections.
C. A database consisting of all backups performed and the contents of each backup.
D. An offsite storage facility to house tapes in case of a disaster for easy site recovery.

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