For UNDO tablespaces, which of the following statements are true? There are 2 correct answers to this question.

For UNDO tablespaces, which of the following statements are true? There are 2 correct answers to this question.
A . The UNDO tablespace MUST be a dictionary managed tablespace.
B . Undo segments are overwritten first after undo retention time.
C . To avoid a tablespace overflow, the UNDO tablespace can be set to be autoextensible.
D . Transformation of rollback- to undo tablespace can be performed with BRSPACE in a one-step procedure.
E . Storage parameters of all undo segments should be equal.

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Answer: B,C