Which three conditions must be true for unused block compression to be used automatically while performing backups by using RMAN? (Choose three.)

The CATDB12c database contains an Oracle Database version 12c catalog schema owned by the RC12C user.
The RCAT11 database contains an Oracle Database version 11g catalog schema owned by the RC11 user in which several databases are registered. Both the databases are open.
You execute the RMAN commands:

Which two tasks are performed as part of the import? (Choose two.)

Which three statements correctly describe the relationship amongst jobs, programs, and schedules within the Oracle Job Scheduler? (Choose three.)

Which statement is true about the ALTER SESSION SET CONTAINER command to switch between containers?

Which three conditions must be true for unused block compression to be used automatically while performing backups by using RMAN?