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單項(xiàng)選擇題

In your database， UNDO_RETENTION has been set to 600 sec and UNDO tablespace is configured for RETENTION GUARANTEE. Which statement regarding RETENTION GUARANTEE is true？ （）

A.Undo data is retained until the next full database backup.
B.No committed undo data will be overwritten for 10 minutes.
C.Committed undo data will be kept forever if not overwritten within 600 seconds.
D.Guarantees that requested undo information are available until the instance is shut down.

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