Which of the following is a type of database model ?

The correct answer is Option D (All of the above). Database models define how data is structured and accessed. The Hierarchical model organizes data in a tree-like structure with parent-child relationships, commonly used in early systems. The Relational model uses tables (relations) to store data and is the foundation of modern SQL databases. The Object-oriented model stores data as objects, aligning with object-oriented programming principles. Since all three are established and widely recognized types of database models, Option D is the correct choice.