Suppose you are choosing between x1 (a bad measured on the horizontal axis) and x2 (a good measured on the vertical axis], then the following holds: Select one or more: Q) a. the slope of the indifference curve is negative 3b. the marginal rate of substitution (MRS) is constant c. the marginal rate of substitution (MRS) is negativeAn Engel curve is continuously upward sloping: Select one or more Wa. irrespective of the good under scrutiny being a normal or an inferior good " b. when the good under scrutiny is a normal good 3 off when the good under scrutiny is an inferior goodWhen the negative income effect is smaller in absolute terms than the positive substitution effect, the good under scrutiny is. Select one or more Da. a normal good Ob. an absolutely inferior good O c. a Giffen good O d. a relatively inferior good