Which of the following is a specialized storage system for long items?

The specialized storage system designed specifically for long items is the cantilever rack. This type of racking is particularly beneficial for storing items that are longer than they are wide, such as lumber, pipes, or metal sheets. The unique design of cantilever racks allows for easy access and storage of these long items, as they do not have front uprights that can obstruct loading and unloading. Instead, they utilize arms that extend outwards and can be adjusted in height, accommodating various lengths of items while maximizing vertical storage space.

Additionally, while pallet racks, drive-in racks, and selective racks serve important functions in storage, they are not specialized for long items. Pallet racks are typically designed for storing standard pallets and bulk products. Drive-in racks are suited for high-density storage and last-in, first-out (LIFO) inventory systems. Selective racks allow for easy access to each pallet but are less effective for storing long items due to their structure. Thus, the cantilever rack stands out as the most appropriate choice for handling long, irregularly shaped products in an efficient manner.