Explanation:
Damaged or lost data files are restored from backups. Redo log file entries are used to roll forward the database. Undo segments are used to roll back any uncommitted transactions. Incorrect Answer:
4: Transactions that were active when the failure occurred will be lost.
5: Transactions that were active when the failure occurred will be lost.
Reference:
OCP Oracle 9i Database: Fundamentals II Exam Guide, Rama Velpuri, p. 124-125
Chapter 6: Backup and Recovery Overview

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