. As trains run along Boston's Green Line, they tend to kick up debris, damaging nearby vehicles. The total amount of damage caused to nearby vehicles depends on the number of trains in operation. The table below captures the number of trains in operation, the corresponding level of prot for Boston's Green Line, and the harm caused to nearby vehicles. Total Prot $ Nearb Vehicles $ a. From a social perspective, what is the optimal number of trains? Suppose transaction costs between Boston's Green Line and nearby vehicle owners are zero. b. If the Green Line's right to operate its trains is protected by a property rule, how many trains will it operate? Justify your answer. c. If the right of nearby vehicles to be the from harm is protected by a property rule, how many trains will operate? Justify your answer. Now suppose transaction costs are prohibitively high between the Green Line and owners of nearby vehicles, e.g., transaction costs are $5. d. If the Green Line's right to operate its trains is protected by a property rule, how many trains will it operate? Justify your answer. 6. If the right of nearby vehicles to be free from harm is protected by a property rule, how many trains will operate? Justify your answer. f. If the right of nearby vehicles to be free from harm is protected by a liability rule (e.g., strict liability), how many trains will operate? Justify your