单项选择题
InwhichscenariowillyouusetheFlashbackTransactionQueryfeature？（）
A.whenyouwanttorestoreanimportanttablethatisdroppedfromtheRecycleBin
B.whenyouwanttoobtaintheSQLstatementstoundothedeletionofsomeimportantrecordsfromatablebyatransaction
C.whenyouwanttorestoreadroppeduser’sschema
D.whenarowofatableisupdatedmanytimeswithinaspecifictimeperiodandyouwantalltheversionsoftherowinthespecifiedtimeperiod