Which three statements are true about undo segments and the use of undo by transactions...

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