A(n) is defined as a distinct unit within a brand or product line distinguishable by size, price, appearance, or some other attribute

The correct answer is stockkeeping unit.

Explanation:

In the field of inventory management, an inventory maintenance unit or SKU refers to a specific item stored in a certain place. The SKU is considered the most disaggregated level when talking about inventory. It is assumed that the units stored in the same SKU are indistinguishable. The introduction of the SKU concept simplifies most inventory control operations. SKUs are sometimes used to designate intangible items, as guarantees; however, in this article we will focus on SKUs that designate tangible items.