What plan will describe the stakeholder groups and the level of formality that is appropriate for the requirements?

The BA Plan outlines the overall approach, activities, and deliverables for business analysis work but does not specifically address stakeholder communication formality.

The Budget Plan covers financial resource allocation and cost management, not stakeholder communication protocols or requirements formality.

The Project Plan addresses the overall schedule, milestones, and resources for the project but does not define stakeholder groups or the formality of requirements communications.

The Business Analysis Communication Plan is designed to document stakeholder groups, their information needs, and the appropriate level of formality and format for sharing requirements. It governs how business analysis information is communicated to each stakeholder audience, making it the direct answer to this question.