Work expansion refers to increasing the number or variability of work tasks at a horizontal level to diversify work. Work enrichment refers to giving employees more complex and more serialized work from the vertical to give employees greater control. Is the following job enrichment? ['Cafeteria folks work in the pasta, salad, vegetable, drink and dessert department rotations.', 'The staff of the postal department has increased from being only dedicated to picking up mail to also being responsible for distributing mail to various postal services.', 'In a transmission data system company, employees can often submit their favorite jobs and then transfer to new positions.', 'At a research institute, a department head told her subordinates that they could do whatever research they wanted, as long as it was within budget and legal.']