Which three statements are true? (Choose three.) 

Answer options:

A. The data dictionary is created and maintained by the database administrator.
B. The data dictionary views consist of joins of dictionary base tables and user-defined tables.
C. The usernames of all the users including database administrators are stored in the data dictionary.
D. The USER_CONS_COLUMNS view should be queried to find the names of columns to which constraints apply.
E. Both USER_OBJECTS and CAT views provide the same information about all objects that are owned by the user.
F. Views with the same name but different prefixes, such as DBA, ALL and USER, reference the same base tables from the data dictionary.

CDF

References: https://docs.oracle.com/cd/B10501_01/server.920/a96524/c05dicti.htm