Final answer:
Product-sustaining costs are the expenses related to supporting an individual product, including product design, quality control, packaging, marketing, and customer support.
Step-by-step explanation:
Product-sustaining costs refer to the costs of activities undertaken to support an individual product. These costs include expenses such as product design, quality control, packaging, marketing, and customer support. They are incurred to ensure the successful development, production, and ongoing maintenance of a specific product.