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.