Explanation:
You will be able to recover all committed data to the point of failure you have a valid database backup with all necessary archived redo log files. Incorrect Answer:
2: During recovery the ARCn background process does not copy its redo entries to the data file.
3: ARCn does not write its log sequence number and the first and last SCN number within the log sequence to the control file.
4: Archived redo log is not identified for recovery use by its redo thread number and destination ID number retrieved from the control file.
Reference:
OCP Oracle 9i Database: Fundamentals II Exam Guide, Rama Velpuri, p. 303
Chapter 12: User-Managed Complete Recovery

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