Non-Functional Requirements in User Stories

Correct Answer: Scalability requirements

The correct answer is 'Scalability requirements' because the user story specifically demands that the system should be able to handle a large number of simultaneous users (100,000) without any loss in transaction processing capabilities, which directly relates to the system's capacity to scale. 'Performance efficiency requirements' might appear correct because they also deal with the system's capability to perform under given conditions but do not specifically address the capacity for simultaneous user handling. 'Reliability requirements' involve the system's uptime and consistency in performance but do not directly imply handling large numbers of users simultaneously. The longest wrong answer addresses the need for data integrity and transaction security, which, although important in a banking context, don't directly relate to the capability of handling a large number of simultaneous users.

Correct Answer: Performance Requirement

The correct answer is Performance Requirement because it directly relates to how well the streaming application can maintain a high-quality service under different network conditions. Adaptability Requirement, while seemingly relevant, is more about the software's ability to change or be changed to fit varied conditions but not specifically related to performance under those conditions. Compatibility Requirement refers to the application's ability to work in different environments or alongside different systems, which is not directly pertaining to streaming quality under varying network speeds. Lastly, Operational Requirement could include aspects such as deployment and maintenance rather than the application's runtime performance under different network conditions.

Correct Answer: Compatibility Requirement

The correct answer is 'Compatibility Requirement' because it specifically refers to the application's ability to function correctly across different versions of operating systems, in this case, iOS and Android from the past 3 years. Operational Requirement focuses on the operations and support needed for the system, Security Requirement refers to the system's ability to protect against unauthorized access or modifications, and Scalability Requirement pertains to the capability of the system to manage increased workload or expansion in scope. These alternatives, while important aspects of system design, do not specifically address the need for cross-version functionality as described in the user story.