Final answer:
When customers present requirements using nouns, it is most appropriate to use Entities or their attributes, which can be modeled in an Entity-Relationship Diagram (ERD).
Step-by-step explanation:
When customers present their requirements using nouns, it typically refers to the things in the system – the data or objects that the system will manage. To model these, you would typically use Entities or their attributes, which are represented in an Entity-Relationship Diagram (ERD). An ERD is a tool commonly used in database design to illustrate the entities in the system and the relationships among them. Use cases (use case diagram) are more focused on interactions and behavior – the actions that users can perform with the system. Relationships are indeed a part of ERDs but are not standalone elements; they describe how entities are related. Process steps (swimlane diagram) would be used if you are modeling the flow of tasks or activities in a process, especially differentiating roles or responsibilities.