in which two scenarios is incomplete recovery required? Which two are true about changing the LOCAL_UNDO_ENABLED property to false in a CDB? (Choose two.)

【多选题】
A After the change, only a common user with the required privilege can create an undo tablespace in CDB&ROOT.
B Any new PDB and existing PDBs are automatically configured to use the default undo tablespace in CDB$ROOT.
C After the change, only one undo tablespace can exist in CDB$ROOT.
D After the change, any user with the required privilege can create an undo tablespace in the PDBs.
E Undo tablespaces existing in PDBs must be dropped before the change.
F After the change, each existing PDB has to be reopened for the new undo mode to take effect.

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