A. The origin of the axis system is at (0, 0). The curve starts on the Coffee axis at the maximum feasible value, then descends in a concave downward arc to the maximum feasible value for donuts on the Donuts axis. Representative points are as follow. (0, 6), (1, 5.25), (2, 4), (3, 2.3), (4, 0). Five points, J, K, L, M, and N, are plotted as follows. Point J is at the maximum feasible value for coffee, (0, 6). Point K is inisde the production possibilities frontier at (1, 4). Point L is on the production possibilities frontier at (2, 4). Point M is at the maximum feasible value for donuts, (4, 0). Point N is outside the production possibilities frontier at (4, 2). Panel B. The origin of the axis system is at (0, 0). The curve starts on the Coffee axis at the maximum feasible value, then descends in a concave downward arc to the maximum feasible value for donuts on the Donuts axis. Representative points are as follow. (0, 6), (1, 5.5), (2, 4.8), (3, 4), (4, 2.9), (5, 1.5), (6, 0). No additional points are plotted.

Refer to Figure 2-4, Graph (a) . Production at point K is

a. possible but inefficient. b. impossible but efficient. c. possible and efficient. d. impossible and inefficient.