In UML, which diagrams are considered behavioral?

In UML (Unified Modeling Language), behavioral diagrams illustrate how systems operate in terms of their interactions and behaviors over time. Sequence diagrams focus on the order of messages exchanged between objects, depicting how processes flow and the timing of those interactions. Activity diagrams represent workflows and activities within a system, showcasing the dynamic aspects of system behavior by illustrating the flow of control from one activity to another.

Options involving Class and Object Diagrams, Deployment and Component Diagrams, or Use Case and Class Diagrams primarily encapsulate structural information rather than behavioral information. Class and Object Diagrams depict the static structure of a system, featuring classes, attributes, and relationships, while Deployment and Component Diagrams illustrate physical architecture and the arrangement of hardware and software components, respectively. Use Case Diagrams highlight the functional requirements and user interactions but do not detail the dynamic behavior as explicitly as Sequence and Activity Diagrams. Thus, the emphasis on interactions and processes in Sequence and Activity Diagrams firmly categorizes them as behavioral diagrams in UML.