【多选题】
A Open the CDB instance in restricted mode. In CDB$ROOT, drop the UNDO tablespace Execute AI TER DAMBASE LOCAL UNDO ON in each PDB. and then restart the CDB instance
B Open the CDB instance in restricted mode. In CDB$ROOT, execute ALTER DATABASE LOCAL UNDO ON. create an UNDO tablespace in each PDB, and then restart the CDB instance.
C Open the CDB instance in upgrade mode. In CDB&ROOT, execute ALTER DATABASE LOCAL UNDO ON, and then restart the CDB instance
D Open the CDB in read-only mode. In CDB$ROOT, execute ALTER DATABASE LOCAL UNDO ON and then change the CDB to read/write mode
E Open the CDB instance in upgrade mode. In each PDB, execute ALTER DATABASE LOCAL UNDO ON, create an UNDO tablespace, and then restart the CDB instance.
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