Explanation:
When using a backup control file a DBA includes USING BACKUP CONTROLFILE option in the RECOVER DATABASE command. You can recover your database when you are missing control files, or when (for whatever reason) you don't use the control files you do have. In this situation, you must use a backup control file in order to perform recovery.
Incorrect Answers:
1: USING BACKUP CONTROLFILE option of RECOVER DATABASE command is required.
2: UNTIL CANCEL option is used for cancel-based incomplete recovery in the RECOVER command.
4: You don't need to recover control file before recovering the database, just use backup copy of control file.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 705-706
Chapter 15: Advanced Topics in Data Recovery

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