（单选题）
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.
正确答案
答案解析
略
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