Q157. Which two are true about RMAN duplexed backup sets?

Q157. Which two are true about RMAN duplexed backup sets? (Choose two.)

• A. A duplexed backup set uses the same number of SBT channels as a non-duplexed backup set forthe same number of files.
• B. A non-duplexed backup set written to disk can be duplexed to disk by backing up the backup setthat is already on disk.
• C. A non-duplexed backup set written to SBT can be duplexed to tape by backing up the backup setthat is already on tape.
• D. A non-duplexed backup set written to disk can be duplexed to tape by backing up the backup setthat is already on disk.
• E. A non-duplexed backup set written to SBT can be duplexed to disk by backing up the backup setthat is already on tape.
• F. A duplexed backup set always uses twice as many SBT channels as a non-duplexed backup set forthe same number of files.