Bidvest International Logistics (BIL), which provides an end-to-end supply-chain solution across a number of different industries, including essential services in the retail, healthcare and perishables sectors, noticed that some clients increased stock levels in preparation for future supply constraints, while volumes for clients providing non-essential services lessened during the Covid-19 pandemic.The volumes of stock ordered by non-essential services lessened during the Covid-19 pandemic as these services were not allowed to trade. This is a function of _____________ which aims to keep inventory levels as low as possible without risking an interruption in the operational processes. Select one: a. purchasing and supply management b. inventory management c. strategic purchasing d. tactical ordering