.A marketing team is planning for a multiyear initiative that will include a lot of cross-functional stakeholders The project manager has been assigned and is now in the project planning phase What item(s) should the project manager develop first?
选项：

A: A product backlog and identification of the features to be delivered
B: A business case and scope document
C: A communications management plan that addresses the team's needs
D: A risk management plan to incorporate known risks