Which three practices are recommended for the Oracle Enterprise Manager Repository?

Which three practices are recommended for the Oracle Enterprise Manager Repository?

A.
For High Availability, Active Data Guard is recommended.

B.
For backup, RMAN is recommended.

C.
For clustering, Oracle RAC is recommended.

D.
For a standby and reporting archive, a MySQL database is recommended.

E.
For partitioning, enabling parallel query in INIT.ORA is recommended.