Which document best provides the boundaries for product development?

After several meetings with different groups of users, a business analyst has gathered the requirements for a large IT project Now, the business analyst needs to document those requirements in a way that is clearly understood by the development team and provides enough information to check if the requirement has been met.
Which of the following would work best in this case?

The technology department identified a defect in the company's software, which leads to an increase in human resource requirements to perform manual transactions as a workaround for tasks that should have been automated. The company begins losing money, so it hires a business analyst to produce a business case that outlines the problem/opportunity, potential options, and a recommendation for how to proceed.
Which of the following analyses must the business analyst perform in order to complete the business case and arrive at a solid recommendation"?

During the initial phase of a project, which technique could assist in identifying and categorizing the stakeholders?

Which of the following techniques is used to identify ambiguous or unverifiable requirements?