Brandy works in a laboratory. She performs experiments to develop new methods of food production and processing. Her job is best described as a(n) . Clarence is an independent worker who offers his services to many different farms. He teaches farmers how to run their farms more efficiently and safely. Clarence's job is best described as a(n) . Leon hires and manages workers who handpick oranges and other fruits on farms. He trains and oversees the workers. Leon's job is best described as a(n)