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.