Explanation:
To recover lost control file you need: copy your binary control file copy to the location of your lost control file (or change the CONTROL_FILES initialization file parameter), run a database recovery using the RECOVER DATABASE USING BACKUP CONTROLFILE command to get the control file current with the current redo log sequence, issue the ALTER DATABASE OPEN RESETLOGS command to reset the redo log sequence number in your control file to zero.
Incorrect Answers:
2: You don't need to rename your control file name with the ALTER SYSTEM command: you can just change the CONTROL_FILES initialization file parameter for this purpose.
3: You don't need to rename your control file name with the ALTER DATABASE command: you can just change the CONTROL_FILES initialization file parameter for this purpose.
4: You can do this with changing the CONTROL_FILES initialization file parameter: control file can change its location.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 719-720
Chapter 15: Advanced Topics in Data Recovery

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