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A. The database will not start.
B. The database will start but will not retain the undo data in the undo segment.
C. The database will start， and the undo segment will contain the undo data for at least one hour.
D. The database will start， and the undo segment will retain the undo data for at least 15 minutes.

A. The database must be in the ARCHIVELOG mode.
B. The automatic memory tuning must be enabled.
C. The change tracking feature must be enabled.
D. The automatic memory tuning must be disabled.