OCP CBT Question 645

Please solve the following question.

You detect a few corrupted blocks in data file `/u01/app/oracle/oradata/ORCL/users01.dbf` (file #4) as indicated by `DB_BLOCK_CORRUPTION` errors in `V$DATABASE_BLOCK_CORRUPTION`. The database is in ARCHIVELOG mode and open. Which RMAN command is suitable for repairing only the corrupted blocks without taking the entire data file offline?

Output from V$DATABASE_BLOCK_CORRUPTION shows:
OWNER     FILE#    BLOCK#   BLOCKS CORRUPTION_CHANGE# CORRUPTION_TYPE
--------- -------- -------- ------ ------------------ ----------------
SYS       4        123      1      123456789          PHYSICAL

RECOVER DATAFILE 4;

RESTORE DATAFILE 4 BLOCK 123;

RECOVER DATAFILE 4 BLOCK 123;

ALTER DATABASE RECOVER DATAFILE '/u01/app/oracle/oradata/ORCL/users01.dbf' BLOCK 123;