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 AUT