Which two statements are true regarding transactions in an Oracle database?

Which two statements are true regarding transactions in an Oracle database? (Choose two.)
A. Multiple transactions can use the same undo segment.
B. A transaction is assigned an undo segment when it is started.
C. More than one transaction cannot share the same extent in the undo tablespace.
D. The transactions use system undo segment to store undo data if all the segments in the undo tablespace are used.

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