15) Calculate the coefficient of variation for each of the following investments (AD) and state which investment has the least amount of risk. (Perform a separate calculation for each investment and show all supporting work) A. Standard deviation =$450, expected retum =$4,500 B. Standard deviation =$600, expected retum =$400 C. Standard deviation =$500, expected retum =$800 D. Standard deviation =$400, expected retum $5,000