Which three statements are true about logical structures of the Oracle database? (Choose three.)
A.
Each segment contains one or more extents.
B.
Multiple tablespaces can share a single data file.
C.
A data block is the smallest unit of input/output (I/O) in data files.
D.
It is possible to have tablespaces of different block sizes in a database.
E.
Each data block in the database always corresponds to one operating system block.
Explanation:
