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.