Justify why rivalry among firms in an industry is typically stronger when which of the following is true about the underlying industry economics? (NOTE: It is possible that more than one, or none, of the answers to this question are correct. You must write one paragraph answers to justify why you included or exclude each of the four options in your answer. Your answer should be four succinct paragraphs long.) a. Fixed costs of production are high. b. There are two competitors in the industry. c. Products are differentiated. d. Production capacity in the industry is low relative to current demand