Robbins Manufacturing produces a variety of plastic containers using an extrusion blow molding process. Classify each of the following activities that are part of Robbins Manufacturing's operating process as either unit-level, batch-level, product-level, or facility-level. 1. Patents are obtained for each new type of container mold. 2. Each type of container has its own unique molds. 3. Routine maintenance is performed on the extrusion machines. The sales force incurs travel expenses to attend various trade shows throughout th Batch-level 4. country to market the containers. 5. Plastic resins are used as the main direct material for the containers. Facility-level 6. The extrusion machine is calibrated for each batch of containers made. Product-level 7. A plant manager oversees the entire manufacturing operation. 8. Rent is paid for the building that houses the manufacturing processes. Unit-Level 9. Each container product line has a product line manager. 10. Each container is cut from the mold once the plastic has cooled and hardened