Describe French and Raven’s five sources of power. In this case, who has power(s) and why?

Just before quitting time, Joe, the hospital’s health information department manager, watched his three new trainees struggling with the complicated electronic medical records software they had to learn to use to do their jobs. Across the room, Betty, who was an expert with the software, was preparing to leave for the day, her tasks done ahead of time as usual. Also as usual, she gathered up her belongings and left without saying good-bye to any of her coworkers. “There goes the answer to my problem,” thought Joe. “If only I knew how to reach her.” With her expertise and experience in using the system, Betty would seem to be an ideal coach for the new employees.