Which of the following is NOT an example of raising rivals' fixed costs? Multiple Choice a. Existing doctors in a particular medical field lobby to require new doctors to acquire new licenses. b. The New York Port Authority lobbying to increase the tolls on New York City's George Washington Bridge. c. Yellow Cab Company lobbying New York City government officials for an ordinance that would require all taxi cab drivers to pay for a medallion, giving them the right to drive a cab in New York City. d. Federal Express lobbying the U. S. Department of Transportation to increase annual terminal fees.