All of the following statements about the sulfur dioxide (SO2) tradeable permits program are true except: Question 3Select one: a. benefited in part from railroad deregulation that made it economically possible for midwestern and east coast power plants to buy low-sulfur coal from Wyoming. b. Generated net benefits and cost savings relative to command-and-control policies that were substantial. c. is effectively no longer in existence today. d. was initially championed by environmental groups like the Sierra Club