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单选题
In which scenario is a Database Administrator NOT required to perform an incomplete recovery?()
A

 when all the online redo log groups are multiplexed and one of the members of a group is missing

B

 when all the online redo log groups are not multiplexed and one log group is missing

C

 when all the control files are missing

D

 when some important tables are deleted from the database and purged from the Recycle Bin


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