Discussion
Which UML diagram shows the interaction between objects over time ?
Answer: C
The diagram is the sequence diagram.
A UML sequence diagram puts the participating objects across the top, each with a vertical lifeline, and shows the messages between them as arrows in time order from top to bottom. It is the diagram used to show how objects interact over time in a scenario.
A class diagram shows static structure: classes, attributes and relationships. A use case diagram shows actors and the system's functions. An activity diagram shows the flow of activities and decisions, like a flowchart, rather than messages between objects.
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