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 due to the Covid-19 global pandemic. Which one of the following is a disadvantage of having too much inventory? Select one: a. More urgent orders. b. Higher unit prices. c. Operating capital is tied up. d. Cost of production interruptions