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Consumers increasingly expect that goods they purchase online will be delivered rapidly, even as soon as the day of purchase. Although efficiencies in long-distance transport of parcels have greatly improved delivery times, last-mile logistics (the final step in delivery to consumers) present a bottleneck for delivery companies. Time pressure resulting from consumer expectations is not the only challenge; other obstacles, such as complex and inefficient delivery routes, persist. While innovations to mitigate these challenges have been emerging—the use of autonomous delivery robots, for instance—success has been constrained due to the additional complications that arise (e.g., robots travel relatively slowly since they must navigate many ground-level obstacles). Consequently, _____