When different series of operations are required in creating small batches of different products, the type of design or layout comes under product design. Thus, option D is correct.
A product or a service that can be sold in the open market and for that product, a price is offered, or sometimes it can be in the form of a barter system.
A product design means that the product that is made in the company is made and has a process for the same. the design can be small changes in the packaging, manufacturing, or the looks of the product.
All the changes made in the product that needs to be changed are often done into small offers, often they are for a promotional purpose like get 12% extra or get free stuff. So all these changes in operation are done in product design. Therefore, option D is the correct option.
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