Which of the following is an appropriate interview question for requirements elicitation?

The selected answer pertains to understanding specific needs regarding data processing, which is a crucial aspect of requirements elicitation. By asking what data quantities are to be processed, the interviewer gathers essential information about the system's expected load and scalability. This helps in determining both the performance requirements and the capabilities that the final product must meet to ensure it functions effectively in real-world conditions.

Understanding data quantities allows stakeholders to make informed decisions about database designs, data storage solutions, and overall system architecture. This kind of question aligns with the primary goals of requirements elicitation, which seeks to uncover detailed information that will drive the development process and lead to a successful project outcome. It sets the stage for further discussions about data management, processing techniques, and resource allocation, making it a critical question during interviews.

The other options, while relevant in certain contexts, do not directly focus on the specific functional requirements and needs of the system's operation, which is the key aim of requirements elicitation. Instead, they tend to address broader operational concerns or contractual details rather than the technical specifications that influence how the system will ultimately perform.