A student is taking two classes. class A and class B. The professor of the class A count only' the worst midterm grade and the professor of the class B count only the best midterm grade. In one of her classes. this student has scores of 50 on her rst midterm and TD on her second midterm. When the rst midterm score is measured on the horizontal axis and her second midterm score on the vertical, her indifference curve has a slope of zero at the point (50, T0}. Therefore this class could 0 be class A but could not be class B. 0 be class B but could not he class A. 0 not be either class A or B. 0 be either class A or B. 0 None of the above