Which command must you execute before starting the reco…

Your database has archive logging enabled and RMAN backups are taken at regular intervals. A data file in the USERS tablespace is damaged.

Which command must you execute before starting the recovery of this tablespace? (Choose the best answer)

A.
ALTER TABELSPACE users OFFLINE;

B.
STARTUP FORCE NOMOUNT

C.
STARTUP FORCE

D.
SWITCH DATAFILE ALL;