Which three statements are true about undo segments and the use of undo by transactions in an Oracle database instance? (Choose three.)
An undo segment may be used by multiple transactions simultaneously
Undo segments can wrap around to the first extent when a transaction fills the last extend of the undo segment
Undo segments have a minimum of three extents
Undo segments can extend when a transaction fills the last extent of the undo segment
A single transaction may use multiple undo segments simultaneously
Undo segments must be stored in a BIGFILE tablespace
Undo segments must be stored in a SMALLFILE tablespace
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