（单选题）
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
正确答案
答案解析
略
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