What does “flashback” mean?

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• What does the DB_FLASHBACK_RETENTION_TARGET parameter configure？（）  

  A .  An upper limit on how far you can flash back the database，depending on the information in the redo logs B .  An upper limit on how far you can flash back the database，depending on the information in the undo tablespace C .  The amount of time for which the flashback data is to be kept in the flash recovery area， provided that there is enough space D .  The amount of time for which the flashback data is guaranteed to be kept in the undo tablespace，provided that there is enough space

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• What does the DB_FLASHBACK_RETENTION_TARGET parameter configure?（）

  A . An upper limit on how far you can flash back the database, depending on the information in the redo logs B . An upper limit on how far you can flash back the database, depending on the information in the undo tablespace C . The amount of time for which the flashback data is to be kept in the flash recovery area, provided that there is enough space D . The amount of time for which the flashback data is guaranteed to be kept in the undo tablespace, provided that there is enough space

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