In the expected return-standard deviation plane, indifference curve is defined as the

Select one:

a.Locus of portfolios that have the same standard deviations and different rates of return

b.Locus of portfolios that have the same expected rates of return and different standard deviations

c.Combinations of portfolios with minimum risk and maximum return

d.Locus of portfolios that offer the same utility according to returns and standard deviations