Answer:
He is acting as a coordinator.
Step-by-step explanation:
Coordinator is a person who coordinates between people, speaks up their ideas, communicate their thoughts, encourages the participants, etc. In this example, there was a discussion going on and people were coming up with a lot of good ideas to approach the management to solve the case study problem. Everyone was looking sure with a plan. So Joe stands up and says that he will make a list of all of the ideas of the participants and write them on the board so that everyone gets aware of the other's idea. So he becomes a coordinator who communicated or coordinated the ideas of people to the other people.