In which scenario will you use the Flashback Transaction Query feature？（）

A、 when you want to restore an important table that is dropped from the Recycle Bin

B、 when you want to obtain the SQL statements to undo the deletion of some important records from a table by a transaction

C、when you want to restore a dropped user’s schema

D、 when a row of a table is updated many times within a specific time period and you want all the versions of the row in the specified time period