What should be done to ensure that the product design meets the stated requirements?

Company A is working on implementing a new platform with multiple stakeholders. The business analyst has gathered the requirements and established a baseline. However, scope creep is a persistent problem.
What could the business analyst have established to help manage this situation?

How can a business analyst show progressive iterations of product development to stakeholders after the requirements baseline has been approved?

The business analyst receives multiple changes from different stakeholders during the requirements gathering phase of a project. How should the business analyst track the requirements throughout the lifecycle of the project to secure the delivery of the expected solution?

Which of the following tools will help facilitate the decision-making process when stakeholders do not agree on the value of an initiative?