为自己加油

Which two are true about backup set compression using RMAN default

Compression? (Choose two.)

A.
Compressed backups can be written only to media.
B.
Binary compression adds CPU overhead to backup operations.
C.
Unused blocks below the high water mark are backed up.
D.
Compressed backups cannot have a section size defined.
E.Compression can be done only for locally managed tablespaces.