Which UML diagrams represent behavioral aspects?

Activity and Use Case diagrams focus on illustrating the interactions and processes within a system, showcasing how different components behave during specific scenarios.

Activity diagrams represent the workflow of a system, detailing the sequential flow of control or data between activities. They are particularly useful for visualizing complex processes, helping stakeholders understand the behavior of a system and the various paths that can be taken.

Use Case diagrams, on the other hand, capture the system's functionality from an end-user perspective. They depict the relationships between users (actors) and the use cases, outlining how different users will interact with the system to achieve specific goals. This highlights the behavioral requirements of the system, emphasizing the actions that users can perform.

In contrast, Class and Object diagrams primarily represent the static structure of a system, focusing on the relationships and attributes of classes and objects rather than their behavior. Similarly, Component and Package diagrams are concerned with the organization and dependencies within the system architecture, while Deployment and Timing diagrams are used for modeling the physical deployment of components or timing constraints rather than representing behavior. Thus, the choice of Activity and Use Case diagrams as the correct answer is due to their distinct focus on system behavior and interactions.