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.