How should a project manager plan communications for a project which has uncertain requirements?

How should a project manager plan communications for a project which has uncertain requirements?
A . Include stakeholders in project meetings and reviews, use frequent checkpoints, and co-locate team members only.
B . Invite customers to sprint planning and retrospective meetings, update the team quickly and on a daily basis, and use official communication channels.
C . Adopt social networking to engage stakeholders, issue frequent and short messages, and use informal communication channels.
D . Adopt a strong change control board process, establish focal points for main subjects, and promote formal and transparent communication.

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Answer: D