Mitch, Sierra, Ed, and Paulette are working in a group on a campaign presentation. Their professor asks them who is leading the group, and Mitch replies, "We have not yet chosen a leader for our group. I think things are going fine as they are." The professor replies, "Sorry, I need to have someone be the leader, so I know with whom I can communicate directly for group updates. Mitch, you are the group leader." What type of leader did Mitch become? A shared leader A task leader An informal leader A formal leader