Which three statements are true about compression of ba…

Which three statements are true about compression of backup sets?

A.
Compressed backups can only be written to media.

B.
Binary compression creates performance overhead during a backup operation.

C.
Unused blocks below the high-water mark are not backed up.

D.
Compressed backups cannot have section size defined during a backup operation

E.
It works only for locally managed tablespaces.