一名工程师正在从事一个设施升级项目。在项目可交付成果目的说明会上，承包商询问了多个工程师无法回答的问题。会议结束后，工程师让承包商根据他们自已对可交付成果的理解提交建议书。若要获得更为明确的可交付成果愿景，项目经理应事先完成哪一项？An engineer is conducting a facility upgrade project.During a meeting to explain the intent of the deliverable, contractors ask multiple questions that the engineer is unable to answer.At the end of the meeting, the engineer asks the contractors to submit proposals based on their own understanding of the deliverable.What should the project manager have completed to obtain a clearer vision of the deliverable?()
（A）：工作分解结构(WBS) Work breakdown structure(WBS)
（B）：项目管理计划 Project management plan
（C）：项目范围 Project scope
（D）：项目章程 Project charter
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