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Why should you back up a duplicated tablespace after a TSPITR is complete？（）  
A: The tablespace cannot be duplicated or restored to any point in time after the duplication. 
B: The tablespace cannot be duplicated or restored to the point in time before the duplication. 
C: The entire database cannot be restored after a TSPITR， so a backup is required.
D: You cannot bring the tablespace online until its been backed up.
E: There is no requirement to do so， as RMAN will back up the tablespace after the TSPITR.

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出自：Oracle认证

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