The correct answer is: D. subschema
A subschema is a subset of a database schema that is used by a particular application. It defines the data that the application needs to access and the relationships between that data.
A module is a self-contained unit of code that can be reused in multiple applications.
A relational model is a way of representing data in a database as a collection of tables.
A schema is a description of the structure of a database. It includes the names of the tables, the columns in each table, and the relationships between the tables.
None of the other options are correct.
