Which of the following is a major difference between the just-in-time (JIT) and traditional approaches to manufacturing? The JIT approach operates with low inventory levels while traditional approaches may operate with high inventory levels. The JIT approach requires centralized purchasing while traditional approaches encourage purchasing decisions by production employees. The JIT approach usually involves many suppliers while traditional approaches usually involve only a small number of suppliers. The JIT approach uses a push-through system while traditional approaches use a pull- through system