Which three resources might be prioritized between competing pluggable databases when creating a multitenant container database plan (CDB plan) using Oracle Database Resource Manager? (Choose three.)

Which three tools or tasks are run by default as part automated maintenance tasks?
(Choose three.)

You want to create a role that:
- is protected from unauthorized usage
- does not use a password embedded in the application source code or stored in a table
- is enabled for a user based on security policies defined in a PL/SQL package How would you create this role?

You want to create a role that:
- is protected from unauthorized usage
- does not use a password embedded in the application source code or stored in a table
- is enabled for a user based on security policies defined in a PL/SQL package
How would you create this role?

You perform RMAN backups for your database and use a recovery catalog for managing the backups. To free space,
you execute this command:
RMAN> DELETE OBSOLETE;
Which three statements are true is this scenario?