You are an investment analyst for De Caul's Investments Inc. , an independent financial consulting firm. Your latest assignment is to provide an independent assessment of RBL . RBL is a Caribbean based company that manufactures building products and provides services for the construction and engineering sectors. The company has several divisions which operate as separate. Saving cash in the bank is not as attractive as it was in the past, and RBL is looking to invest some of its surplus cash. In a meeting with senior managers in the company, you mention the Modern Portfolio Theory which was pioneered by Markowitz. Explain to the senior managers, a. The purpose of the Markowitz Portfolio Theory, b. What is the key component of the theory