Answer:
a. Product Line.
Explanation:
Product line refers to a group of products that are closely related because they function in a similar manner and are sold to the same customer groups and marketed through the same types of outlets. All of the product which fall under a same product line have the same functionality. Organizations can sell more than one single product lines under different brand names, and try to differentiate them from one another to give better usability for their customers. For example, if a cosmetic brand sells high-end product of line of makeup (powder, eyeliner, mascara, lipstick and foundation) can also launch another product line of the same products for a lower-end customers as well.
