A database instance uses an SPFILE. Examine the parameter:

You plan to multiplex the control file to a new location, parallelization for the backup
set./u01/app/oracle/oradata/cdb1/disk3/control03.ctl/.
Examine the possible steps that are in random order:
1. Shut down the database instance.
2.Issue ALTER SYSTEM SET CONTROL_FILES='/u01/app/oracle/oradata/cdb1/disk1/
control01.ctl, /u01/app/oracle/oradata/cdb1/disk2/control02, ctl,
/ u01/app/oracle/oradata/cdb1/disk3/control03.ctl'
SCOPE=SPFILE;.
3. Issue ALTER SYSTEM SET CONTROL_FILES
' /u01/app/oracle/oradata/cdb1/disk1/control01.ctl, /u01/app/oracle/oradata/
cdb1/disk2/control02.ctl, /u01/app/oracle/oradata/cdb1/disk3/control03.ctl';.
4. Copy the control file from the existing location to '/u01/app/oracle/oradata/cdb1/disk3/
control03.ctl'.
5. Mount the database.
6. Open the database.
Identify the required steps in the correct order to accomplish the task.