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The UNDO_RETENTION parameter in your database is set to 1000 and undo retention is not guaranteed. Which statement regarding retention of undo data is correct？（）
A:Undo data becomes obsolete after 1，000 seconds.
B:Undo data gets refreshed after every 1，000 seconds.
C:Undo data will be stored permanently after 1，000 seconds.
D:Committed undo data would be retained for 1，000 seconds if free undo space is available.
E:Undo data will be retained in the UNDO tablespace for 1，000 seconds，then it gets moved to the TEMPORARY tablespace to provide read consistency.

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出自：Oracle认证

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