- RDBMS refers to a system that uses a database catalog (IV) to store data in related tables (III).
- Primary Key is used for the unique identification of tuples (I).
- A tuple is a collection of attributes, which store attribute values (II).
- Database Schema and Constraints refer to how the schema defines the database structure and its constraints (III).
Therefore, the correct answer is "A-IV, B-I, C-II, D-III."