Your brother-in-law’s investment portfolio consists solely of $10,000 invested in McDonald’s stock. Suppose the risk-free rate is 4%, McDonald’s stock has an expected return of 9% and a volatility of 27%, and the market portfolio has an expected return of 10% and a volatility of 16%. Under the CAPM assumptions, which portfolio has the lowest possible volatility while having the same expected return as McDonald’s stock? Which portfolio has the highest possible expected return while having the same volatility as McDonald’s stock?