A major source of uncertainty in EC is the ________. Question 5Select one: A. order-taking process B. distribution C. third-party logistics D. demand forecastWith a ________ , products on the delivery truck are not preassigned to a destination, but the decision about the quantity to unload at each destination is made at the time of unloading. Question 6Select one: A. merge-in-transit B. bullwhip effect C. reverse logistics system D. rolling warehouse