Final answer:
The system focused on planning product or parts requirements according to the master production schedule is Material Requirements Planning (MRP).
Step-by-step explanation:
The type of system that involves mainly planning the product or parts requirements according to the master production schedule is d) MRP (Material Requirements Planning). Material Requirements Planning (MRP) is a system designed to coordinate ordering and delivery of materials with the production schedule. It interfaces with design engineering in coordinating the release of new products, estimates manufacturing costs, determines time standards, and makes recommendations for tooling and process requirements of new or existing product lines. MRP systems are critical for manufacturers as they maintain records and reporting systems for the coordination of manufacturing operations, and are part of a larger Enterprise Resource Planning (ERP) system but are specifically focused on the materials component of manufacturing.