Which statements are true?

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Which statements are true? (Choose all that apply.)

A.
The data dictionary is created and maintained by the database administrator.

B.
The data dictionary views consists of joins of dictionary base tables and user-defined tables.

C.
The usernames of all the users including the database administrators are stored in the data dictionary.

D.
The USER_CONS_COLUMNS view should be queried to find the names of the columns to which a constraint
applies.

E.
Both USER_OBJECTS and CAT views provide the same information about all the objects that are owned by
the user.

F.
Views with the same name but different prefixes, such as DBA, ALL and USER, use the same base tables
from the data dictionary.

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

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