Which one of the following statements best describes the contribution of the Capital Asset Pricing Model (CAPM) to our understanding of risk and return? a. We can move on from the CAPM because of its lack of success in predicting future returns. b. The CAPM teaches us important lessons about diversification and the role of systematic risk. c. The CAPM relies on assumptions; therefore, we should not trust it. d. None of the options provided.