Supply chain management refers to a set of approaches and techniques firms employ to efficiently and effectively integrate their manufacturers, warehouses, transportation intermediaries, stores, and ___.

suppliers (or vendors)

Explanation:

Supply chain management refers to how the company manages:

the distribution and storing of materials needed to manufacture a product (upstream) the inventory management of materials, components and final goods the distribution of finished goods to final customers using different downstream channels (wholesalers, retailers, etc.)