Q153 Which two are true about using RMAN to perform an open database back up of this tablespace?

Q153. The USERS tablespace consists of data files 3 and 4 and must always be online in read/write mode.
Which two are true about using RMAN to perform an open database back up of this tablespace?(Choose two.)

A. Backups must be done incrementally.
B. Backups must be contained in backup sets.
C. Backups can be taken only if the database is in ARCHIVELOG mode.
D. Backups can be done incrementally.
E. The database must be registered in an RMAN catalog.
F. Only consistent backups can be created.