Explanation:
For the database in ARCHIVELOG mode you can do online hot backup, operating system backups for closed database and online control file backups with the ALTER DATABASE BACKUP CONTROLFILE command.
Incorrect Answers:
3: There is no the ALTER CONTROLFILE BACKUP command in Oracle.
4: There is no the ALTER DATABASE BACKUP CONTROLFILE command for online table space backups in Oracle.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 577-585
Chapter 12: Overview of Backup and Recovery

---