问题：
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
● 参考解析
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