Final answer:
The primary activities of manufacturing planning and control include production planning and implementation and control. These tasks are critical to the execution and oversight of the manufacturing process, while inventory management serves as a supporting activity.
Step-by-step explanation:
The primary activities of manufacturing planning and control are integral to the successful production and delivery of products. Among the activities listed:
- Production planning involves forecasting demand, determining production levels, and setting production schedules to meet customer requirements.
- Implementation and control includes the execution of the production plan and monitoring the production process to ensure that production targets are met efficiently and effectively.
- Inventory management, though crucial to manufacturing, is a support activity that ensures availability of materials needed for production and management of finished goods.
Considering these points, the correct answer to which activities are primary in manufacturing planning and control would be D. Both I and II, since both production planning and implementation and control are central functions.