C) vendors, intermediaries, and buyer exchange systemsThe three major variations of online catalogs are organized by vendors, intermediaries, and buyer exchange systems. That is, it is common to receive catalogs from vendors (i.e., Office depot, Lands end, etc.), catalogs from intermediaries that promote goods from multiple vendors within the same industry (i.e., office supply catalog, automotive part catalog, gardening supply catalog), and catalogs from buyer exchanges where buyers from a particular industry can economically purchase large quantities of goods (i.e., Marriot and Hyatt using Avendra to save money on hotel goods).