When Casey began her PhD program, she was immediately assigned to a $\_\_\_\_\_\_\_\_$ who would serve as a coach and guide to shorten the curve and help Casey meet the right people who could enhance her career. Her program also required $\_\_\_\_\_\_\_\_,$ where she would spend four to six weeks in different labs, gaining experience and exposure to a variety of research in her field of study.Multiple Choicejourneyman; networkunderstudy; vestibule trainingmentor; job rotationmentor; off$-$the$-$job training