Which of the following is a type of Requirement?

The correct choice identifies a Non-Functional Requirement, which is a critical aspect of capturing the specifications for a system. Non-Functional Requirements refer to criteria that can be used to judge the operation of a system, rather than the specific behaviors or functions it must perform. These relate to the quality attributes of a system such as performance, usability, reliability, security, and scalability. They set the standards and constraints within which the functional requirements must operate.

Including Non-Functional Requirements is essential because they impact user experience and the overall effectiveness of the system. For instance, if a system is fast but not secure, it may jeopardize user satisfaction and trust. Therefore, understanding and documenting Non-Functional Requirements ensures that all stakeholders have a clear idea of the expected performance qualities of the system, fostering an environment in which the system can thrive in real-world applications.

The other types of requirements—such as Functional Requirements, which define specific behaviors and functions that a system must exhibit—are important too, but they don't cover the broad spectrum of system performance and quality criteria that Non-Functional Requirements do.