用万用表电阻档测量CAN-H和CAN-L之间的电阻，正常情况下应该有一个规定的电阻，应该直接导通。
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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 Bi
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