Explanation:
Start up only is required for recover from an instance failure. Incorrect Answer:
2: It is not required to restore data files after an instance failure.
3: You just need to start up the database. Backup recovery is not required.
4: Point in time incomplete recovery is not required in case of instance failure.
Reference:
OCP Oracle 9i Database: Fundamentals II Exam Guide, Rama Velpuri, p. 124-125
Chapter 6: Backup and Recovery Overview

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