A project plan describes the business need (the problem the project will solve) and the justification, requirements, and current boundaries for the project. The correct option of this question is c i.e. project plan.
A project plan is formal documentation that defines the stages of the project and its execution. This includes the business need, the resources required and their justification and optimized application and the extents of the project. Project planning is done by the project managers and project planning softwares is used for this purpose. It is the who, how, what, why, where and when of a project.
The other options are incorrect because:
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