Which three statements are true about database storage structures?

Which three statements are true about database storage structures? (Choose three.)

A.
Tablespaces comprise one or more datafiles.

B.
Segments can span datafiles within a tablespace.

C.
Datafiles can belong to more than one tablespace.

D.
Segments can span datafiles across tablespaces.

E.
Data objects are stored as segments in tablespaces.