Product line depth:Multiple Choice$800\mathrm{.}12\mathrm{.}28$is the complete set of all products offered by a firm.is the number of product categories within a product line.are groups of associated items, such as items that consumers use together or think of as part of a group of similar products.represents the number of product lines offered by the firm.is an assortment of items that the customer sees as reasonable substitutes for one another.