Which of the following is an example of a non-functional requirement?

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A non-functional requirement refers to criteria that can be used to judge the operation of a system, rather than specific behaviors or functions. These requirements specify how a system performs a function rather than what function it performs.

Response time is a prime example of a non-functional requirement because it defines how quickly the system should respond to user inputs or requests. This impacts the overall user experience and system performance, encompassing aspects like speed, scalability, reliability, and security. Non-functional requirements like response time are crucial for ensuring that the system meets user expectations and operates effectively in a real-world environment.

In contrast, system functionality, user interface design, and business rules primarily focus on what the system should do, rather than specifying constraints or performance characteristics related to those functions. Hence, they are typically categorized as functional requirements, which outline specific behaviors or outputs expected from the system.