Answer :
Final Answer:
The elements not shown in sequence diagrams are states. Therefore the correct answer is option b.
Explanation:
a) Sequence diagrams are a type of Unified Modeling Language (UML) diagram used to visualize the interactions between different components or objects in a system over time. In sequence diagrams, actors (a), objects (c), and lifelines (d) are commonly represented.
Actors represent external entities interacting with the system, objects represent instances of classes, and lifelines depict the existence of an object over a certain period. However, states (b) are not explicitly shown in sequence diagrams.
b) Sequence diagrams focus on depicting the chronological order of interactions between objects or components, emphasizing the messages exchanged during the execution of a scenario.
States, on the other hand, are better represented in state diagrams, another type of UML diagram specifically designed to illustrate the different states of an object and transitions between them.
c) In summary, sequence diagrams primarily capture the dynamic aspects of a system, emphasizing the flow of messages and interactions between objects, actors, and lifelines.
States, which pertain to the static aspects of an object's behavior, are not directly shown in sequence diagrams. Understanding the specific purpose of each UML diagram helps in choosing the most appropriate one for accurately modeling different aspects of a system. Therefore the correct answer is option b.
