Use cases contain which of the following elements?

Use cases are a fundamental part of system modeling in software development, particularly in object-oriented programming. They are designed to capture the functional requirements of a system from the end-user's perspective. The correct answer highlights the two key components of use cases: actors and scenarios.

Actors represent the users or other systems that interact with the application. They can be human users, external systems, or any entity that communicates with the system under consideration. Identifying the actors is crucial because it helps establish who will benefit from or be affected by the system's functions.

Scenarios describe the specific interactions between the actors and the system. They outline the steps taken to achieve a particular goal or task within the system. This narrative helps clarify how the system will behave under various conditions and ensures all necessary functionalities are considered.

Other options, while relevant to software design and architecture, do not align with the specific purpose and structure of use cases. Classes and attributes pertain to the structure of objects in object-oriented programming, methods and constructors are more about implementation details in class design, and interfaces and implementations relate to how different parts of a program communicate and work together. These elements are important in their own right but do not capture the essence of what use cases are designed to achieve.