单项选择题

A.whenatableisdroppedandstoredintheRecycleBin
B.whenatableisdroppedandpurgedfromtheRecycleBin
C.whenyouarerequiredtorecoveranexistingtabletoitspreviousstate
D.whenyouarerequiredtoviewalltheversionsofarowofanexistingtablebetweenaspecifictimeperiod
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