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？ （）
- AUndo data is retained until the next full database backup.
- BNo committed undo data will be overwritten for 10 minutes.
- CCommitted undo data will be kept forever if not overwritten within 600 seconds.
- DGuarantees that requested undo information are available until the instance is shut down.