In which scenario do you use the Flashback Database feature？（）
A. when a table is dropped and you restore it from the Recycle Bin
B. when a user’s schema is dropped and you recover the user’s schema
C. when some incorrect data is inserted in the table and you retrieve the table to a state that was at a certain timestamp
D. when a row of a table is updated frequently and committed， and you view all the versions of the row within a specific duratio
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