Jake and Harry each have 130 hours of college credit from Impressive University. Each has 30 hours of economics. Jake has a bachelor's degree, while Harry is 3 credits short of required physical education classes and therefore does not have a degree. Each of them has one year of experience as a market analyst for ABC Company. Assuming that the physical education class would not enhance Harry's job performance, if Jake earns a higher salary than Harry, the ABC Company may subscribe to the Question 18 options: a) human capital theory. b) compensating differential theory. c) signaling theory. d) discrimination theory