In a return-standard deviation space, which of the following statements is(are) false for risk-averse investors? (The vertical and horizontal lines are referred to as the expected return-axis and the standard deviation-axis, respectively.) 1) An investor's own indifference curves might intersect. 11) Indifference curves have positive slopes. III) Indifference curves of two investors cannot intersect. I and II only II and III only Only 1 Only III I and