Consider the six portfolios in the image below. A risk-averse investor must select a single portfolio (assume that this investor does not hold any other assets). Which portfolio(s) should such an investor NOT invest in? If there is more than one such portfolio, you must select all that apply in order to obtain credit. Credit will not be rewarded if a wrong answer is chosen. Investment 4 Investment 6 Investment 2 Investment 1 Investment 3 Investment 5