D is corrent. The data definition language defines the database structure and content, especially the schema and subschema descriptions, including the names of the data elements contained in the database and their relationship to each other.
A is incorrect. Data manipulation language provides application programs with a facility to interact with the database to facilitate adding, changing, and deleting either data or data relationships.
B is incorrect. Data command interpreter languages are symbolic character strings used to control the current state of database management system operations.
C is incorrect. The data control language is a type of database language used to specify the privileges and security rules governing database users.
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