单选题Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and you connect RMAN. You want to issue the following RMAN command: RMAN BACKUP TABLESPACE hr_pdb:userdata; Which task should you perform before issuing the command?（）APlace the root container in ARHCHIVELOG mode.BTake the user data tablespace offline.CPlace the root container in the nomount stage.DEnsure that HR_PDB is open.
单选题
Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and you connect RMAN. You want to issue the following RMAN command: RMAN > BACKUP TABLESPACE hr_pdb:userdata; Which task should you perform before issuing the command?（）
A
Place the root container in ARHCHIVELOG mode.
B
Take the user data tablespace offline.
C
Place the root container in the nomount stage.
D
Ensure that HR_PDB is open.
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