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 CDBSROOT.
B Any new PDB and existing PDBs are automatically configured to use the default undo tablespace in CDBSROOT
C After the change,only one undo tablespace can exist in CDBSROOT
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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