Answer:
a. complement
Step-by-step explanation:
A product can be defined as any physical object or material that typically satisfy and meets the demands, needs or wants of customers. Some examples of a product are mobile phones, television, microphone, microwave oven, bread, pencil, freezer, beverages, soft drinks, etc.
In this scenario, Nintendo built a security chip into its game console hardware and then licensed the right to develop games to outside firms. Subsequently, royalties are then paid by the business firms to Nintendo for each copy of the game sold. Thus, this is an example of Nintendo using complement products.
A complementary product can be defined as any product that's typically used in conjunction with another product and as such it adds value to the other product.