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You require the Oracle server to manage the undo segments and space among various active sessions automatically. You created an undo tablespace， UNDO_TBS1， in your database. Which two additional steps would you perform to achieve this？（）
A:Set the UNDO_RETENTION parameter to 900 or more.
B:Create an initial undo segment in the undo tablespace.
C:Enable the retention guarantee for the undo tablespace.
D:Set the UNDO_TABLESPACE parameter to UNDO_TBS1.
E:Set the UNDO_MANAGEMENT initialization parameter to AUTO.

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出自：Oracle认证

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