【多选题】
A Control file backups can be created while connected to cdb$root
B The BACKUP TABLESPACE command can back up a PDB tablespace even if RMAN is connected to CDB$ROOT
C Online Redo Log backups can be created while connected to CDB$ROOT.
D Control file backups can not be created while connected to a PPB.
E Archived Redo Log backups can be created while connected to PDB
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