Explanation:
You should enter the keyword CANCEL because redo log with sequence 61 is not archived yet. Incorrect Answer:
1: If you type the keyword AUTO Oracle will try to find archived redo log with sequence 61 that is not archived yet, so recovery command will fail.
3: If you press the Enter or Return key Oracle will try to find archived redo log with sequence 61 that is not archived yet, so recovery command will fail.
4: You should not enter filename because redo log with sequence 61 is not archived yet.
Reference:
OCP Oracle 9i Database: Fundamentals II Exam Guide, Rama Velpuri, p. 336-337
Chapter 14: User-Managed Incomplete Recovery

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