Martin, a manager at a theme park in Texas, has noticed that Jess, one of the employees, seems to be having interpersonal problems with some of the other employees and it is affecting his department's service. Martin doesn't want to fire Jess, so he spends extra time with Jess listening to his concerns and helping him figure out ways to correct his performance problems. Martin is acting as _____ .
a friend
a coach
a mentor
a counselor