Choose the statement that isincorrect. A. Indifference curveis a curve formed by plotting a set of points (x,y)(x,y) on the XY-plane that result in the same utility level in a utility function of two variables." b. "The law of diminishing marginal utility is the law that marginal utility gradually decreases with increasing consumption of a good." c. "Marginal rate of substitution indicates how many units of consumption of another good must be increased to maintain the utility level when consumption of one good is reduced by one unit." d. "For utility functions u(x,y)u(x,y), there is always only one set of goods that maximizes utility