A project manager receives an initial project assignment. Which of the following documents is MOST likely to indicate the organizational structure for the project?

The communication management plan describes how information will be distributed among stakeholders but does not define organizational hierarchy or responsibility assignments.

A baseline is a fixed reference point for scope, schedule, or cost measurement and contains no information about organizational structure.

A business case justifies the project investment by outlining costs, benefits, and strategic alignment, not the organizational structure of the project team.

An Organizational Breakdown Structure (OBS) is a hierarchical representation that links the organizational units responsible for project work to the WBS work packages. It is the purpose-built document for identifying who owns what within a project's organizational structure. A project manager receiving a new assignment would consult the OBS to understand reporting relationships and accountability.