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单项选择题 You executed the following query： SELECT operation， undo_sql， table_name FROM flashback_transaction_query; Which statement is correct regarding the query output？（）: A、It would return information regarding only the last committed transaction.; B、It would return only the active transactions in all the undo segments in the database.; C、It would return only the committed transactions in all the undo segments in the database.; D、It would return both active and committed transactions in all the undo segments in the database.; E、It would return information regarding the transactions that began and were committed in the last 30 minutes.

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