Which three statements are true about database recovery operations？（）
A. Damaged or lost data files are restored from backups.
B. Redo log file entries are used to roll forward the database.
C. Undo segments are used to roll back any uncommitted transactions.
D. Transactions that were active when the failure occurred are restarted.
E. Transactions that were active when the failure occurred are automatically committed during the recover procedure.
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