Which two statements are true about unified auditing? (Choose two.)

Examine these actions:
1. Log in to CDB$ROOTas a user with the SYSDBAprivilege.
2. Log in to the PDB as a user with the SYSKMprivilege.
3. Ensure that the CDB keystore is open.
4. Ensure that the CDB keystore is closed.
5. Export the PDB key information.
6. Export the CDB key information.
7. Shut down the CDB.
8. Shut down the PDB.
9. Unplug the PDB.
Which of these are required to unplug an encrypted PDB?

Examine the command used to perform an incremental level-0 backup:
RMAN> BACKUP INCREMENTAL LEVEL0 DATABASE;
To enable block change tracking, after the incremental level 0 backup, you issue the command:
SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING
FILE'/mydir/rman_change_track.f';
To perform an incremental level-1 cumulative backup, you issue the command:
RMAN> BACKUP INCREMENTAL LEVEL1 CUMULATIVE DATABASE;
Which two statements are true in the preceding situation? (Choose two.)

Which two are benefits of unified auditing in full mode?

You are administering a multitenant container database (CDB) that contains two pluggable databases (PDBs), PDB1 and PDB2. You are connected to PDB2 as a common user with DBA privileges.
The STATISTICS_LEVEL parameter is PDB modifiable.
As the user SYS, execute the following command on PDB2:
SQL> ALTER SYSTEM SET STATISTICS_LEVEL=ALL SID='*' SCOPE=SPFILE;
Which statement is true about the result of this command?