Final answer:
The data dictionary object that contains a column named HIDDEN_COLUMN in the PROMOTION table is the table definition or metadata of the PROMOTION table.
Step-by-step explanation:
The data dictionary object that contains a column named HIDDEN_COLUMN in the PROMOTION table is the table definition or metadata of the PROMOTION table. The data dictionary is a collection of metadata that describes the structure and properties of database objects. The data dictionary in a relational database management system (RDBMS) is a set of tables and views that contain metadata about the database. To find out which dictionary object contains a column named HIDDEN_COLUMN, one would typically query the data dictionary. An example of such a query in an Oracle database might be to look at the ALL_TAB_COLS or USER_TAB_COLS views, which contain information about columns in tables accessible to current user or owned by the user, respectively. For a PROMOTION table, one would look for HIDDEN_COLUMN in the column listings of these views.