How do you configure a CDB for local undo mode?

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How do you configure a CDB for local undo mode?

A.
Open the CDB instance in upgrade mode. In CDB$ROOT, execute ALTER
DATABASE LOCAL UNDO ON, and then restart the CDB instance.

B.
Open the CDB instance in restricted mode. In CDB$ROOT, execute ALTER
DATABASE LOCAL UNDO ON, and create an UNDO tablespace in each PDB,
Then restart the CDB instance.

C.
Open the CDB instance in restricted mode. In CDB$ROOT, drop the UNDO
Tablespace. Execute
ALTER DATABASE LOCAL UNDO ON in each PDB, and then restart the CDB
Instance.

D.
Open the CDB instance 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.
正确答案A
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