Exam PgMP topic 1 question 38 discussion

You are the project manager for your organization and are working with the project stakeholders and the business analyst to define all of the deliverables the project is to create. The stakeholders would like the option of adding more deliverables later in the project and keeping the requirements somewhat open for changes. You explain to the business analyst that you need a set of requirements that define exactly what needs to be delivered for the project. What document are you trying to create in this early stage of the project?