Which of the following best describes why retailers like Walmart and Meijer tend to have dense clusters of stores in the areas immediately around their distribution centers, but then density of stores diminishes as one moves away from the distribution centers (DCs)? Question 7 options: a) Lower transportation costs to replenish stores close to DCs causes retailers to want to maximize revenue in the geographic area immediately around a DC, which is best done with a dense network of stores. b) Management wants to minimize the carbon footprint of their operations, which can be better achieved with this network structure. c) DCs are always located in urban areas, meaning that it makes sense to have more stores due to greater competition. d) It is easier for upper management to closely monitor stores closer to the distribution center