Answer:
The correct answer is Requirements.
Step-by-step explanation:
The purpose of the requirements discipline is:
Establish and maintain an agreement with customers and other stakeholders about what the system should do.
Provide system developers with a good understanding of system requirements. Define the limits of the system (delimit it).
Provide a basis for planning the technical content of the iterations.
Provide a basis for estimating the cost and time to develop the system.
Define a user interface for the system, focusing on the needs and goals of the users.
To achieve these objectives, it is important, first of all, to understand the definition and scope of the problem that the system is trying to solve. Stakeholders are identified and stakeholder requests are obtained, gathered and analyzed.
From there, the work products of the requirements are developed to fully describe the system (what the system is going to do) in an effort that perceives all stakeholders, including customers and potential users, as important sources of information ( in addition to the system requirements).