Which four statements are true about this administrator…

An administrator account is granted the CREATE SESSION and SET CONTAINER system privileges.
A multitenant container database (CDB) instant has the following parameter set:
THREADED_EXECUTION = FALSE
Which four statements are true about this administrator establishing connections to root in a CDB that has been
opened in read only mode?

A.
You can conned as a common user by using the connect statement.

B.
You can connect as a local user by using the connect statement.

C.
You can connect by using easy connect.

D.
You can connect by using OS authentication.

E.
You can connect by using a Net Service name.

F.
You can connect as a local user by using the SET CONTAINER statement.

Explanation:
http://docs.oracle.com/database/121/ADMIN/cdb_admin.htm