Which of the following correctly describes a Non-Functional Requirement?

A Non-Functional Requirement refers to the criteria that can be used to evaluate the operation of a system, rather than its specific behaviors or functionalities. These requirements often encompass aspects such as performance, usability, reliability, and security.

Access, Usability, Back-up, and Recovery are all key elements of non-functional requirements.

• Access covers how users will gain entry to the system, which is crucial for ensuring that a system is properly designed to allow users to interact with it efficiently and securely.
• Usability concerns how easy and intuitive it is for users to operate the system, which directly impacts user satisfaction and effectiveness.
• Backup and recovery pertain to the system's capabilities in terms of safeguarding data and ensuring that it can be restored in the event of a failure, which is essential for operational reliability and continuity of business processes.

These elements highlight how the system does what it does, which is fundamental to non-functional requirements.

Other options address different aspects relevant to a business environment or system functionality but do not encapsulate the essence of non-functional requirements as effectively. For instance, data entry and retrieval pertain more directly to functional requirements, while business policies focus on governance rather than system performance metrics.