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You are using Recovery Manager (RMAN) to perform backups. In which three situations would you perform a compressed backup?（）
A:You are backing up to tape and your tape device performs its own compression.
B:You are making image copies, and you have not enabled tablespace compression.
C:You are using disk-based backups and disk space in your Flash Recovery Area, or other disk-based backup destinations are limited.
D:You are performing your backups to some device over a network where reduced network bandwidth is more important than CPU usage.
E:You are using some archival backup media, such as CD or DVD, where reducing backup sizes saves  media costs and archival storage.

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出自：Oracle认证

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