In the early 20th century, radio and film were two of the largest media industries in the world. most of the major film corporations at this time made substantial profits by owning all stages of the production and distribution process. how would you compare or contrast the economic model of the radio industry to that of the film industry? a. both industries were vertically integrated. b. the radio industry was broken up into a large number of companies that produced different types of equipment while the film companies produced all of their own equipment. c. the radio industry was horizontally integrated while the film industry was vertically integrated. d. the radio industry depended on subsidies from the american government while the film industry did not need assistance due to its mature model of vertical integration.