2.4) Which statement/statements on the most important concepts of finance are true A In a portfolio of several investments, risk is additive but returns are not B Return should be measured with the internal rate of return (IRR) because it is the most accurate measure C Common stocks are riskier than treasury bills D Higher risk in fairly efficient financial markts is associated with higher returns E Because probabilsitic risk measurement is not possible often, risk is proxied from historical data and the past using the standard deviation and variance of returns.