4 - Transportation/Assignment Model (20%) Your team has been assigned to plan and execute the transportation of 1 ton of Grecoite from Columbus, OH to Beijing. Grecoite is an enormously important material that becomes increasingly unstable during transportation. The plan is to secure the material in an underground facility in Beijing. It is believed the natural coolness of the underground facility will stabilize the material indefinitely until a more permanent method to permanently dispose of the Grecoite can be affected. The transportation must be completed in less than 14 days. Exposing the Grecoite to a longer period could result in a cataclysmic explosion, having possible far-reaching negative effects to human populations. Your team reached out to both the Justice League and the Avengers, who each refused to be responsible for such a payload. Left with only conventional travel methods, your team has established an array of possible routings involving a total of 20 cities and 4 transportation modes (Air, Sea, Rail, Truck). Given the following cost, speed, and distance information and the routing diagram, develop an assignment/transportation model which transports the Grecoite within the allotted time at the lowest cost. Transportation Method Sea Rail Truck Air Cost Per Mile