Composition, aggregation and association are shown in a :

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The question asks which diagram type shows composition, aggregation, and association.
Option 1: 'sequence diagram' – This diagram focuses on the order of interactions over time between objects, not on structural relationships like composition, aggregation, or association. Therefore it does not illustrate those relationships.
Option 2: 'use case diagram' – Use case diagrams depict system functions and actors, highlighting functional requirements rather than internal structural relationships among classes. Composition, aggregation, and association are not primary features shown here.
Option 3: 'statechart diagram' – Statecharts model the states and transitions of a system or object over time, emphasizing behavior across states rather than the static relationships between classes. They do not convey composition or aggregation.
Option 4: 'class diagram' – Class diagrams are specifically designed to represent the static structure of a system, including classes and the relationships between them such as association, aggregation, and composition. This makes them the correct choice for illustrating these relationships.

Composition, aggregation and association are shown in a :

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