Final answer:
Dean is fulfilling the disseminator role by sharing key product test results within different levels and departments of Infinity Inc.
Step-by-step explanation:
In this scenario, Dean is fulfilling the d. disseminator role. A manager who acts as a disseminator primarily passes on information to subordinates, peers, and others within the organization. By relaying key product test results from the research department to the marketing and branding departments, and summarizing the data for the head of his department, Dean is doing exactly that. This role is essential for ensuring that important information is communicated effectively throughout different levels and departments within an organization.