Which two statements correctly describe the relation between a data file and the logical database structures?

Which two statements correctly describe the relation between a data file and the logical database structures? (Choose two.)

A.
An extent cannot spread across data files

B.
A data block can spread across multiple data files as it can consist of multiple operating system (OS) blocks

C.
A data file can have only one segment created in it

D.
A segment cannot spread across data files

E.
A data file can belong to only one tablespace