What do scenarios and use cases help illustrate?

Scenarios and use cases are tools used to describe how a person or system achieves specific goals, which makes the choice of "C" the correct answer. Scenarios provide a narrative that outlines the context in which a user interacts with a system, while use cases define specific interactions between users (or "actors") and the system to accomplish particular tasks.

By focusing on the goals of the user or the system, these tools clarify the requirements from the perspective of what needs to be accomplished. This goal-oriented approach is essential in requirements analysis as it helps stakeholders understand not just what the system is supposed to do, but how it supports the needs of its users in real-world situations. Through this methodology, teams can better design systems that prioritize user objectives, leading to improved usability and functionality.

In contrast, other options address different aspects. For example, understanding the interaction of systems and hardware focuses on technical specifications, which is not the primary goal of scenarios and use cases. Similarly, while user experiences with technology are influenced by scenarios, the overarching purpose is more about goal achievement than just experience. Lastly, eliciting challenges in system operations can be important, but it does not capture the primary focus of how users achieve their goals through the system. Therefore,