Which three pieces of information are considered while deciding the size of the undo tablespace in your database?

Which three pieces of information are considered while deciding the size of the undo tablespace in your database? (Choose three.)

A.
undo blocks generated per second

B.
the size of an undo block

C.
the size of the database buffer cache

D.
the size of the redo log files

E.
the value of the UNDO_RETENTION parameter