Question 14 {1 point} Which of the following statements about Production Possibility.r Frontiers [PPFJ in a two good economy are always TRUE? l. A PPF is concave (bowed outward} when the opportunity cost of producing a good increases as more is produced ||. A PPF is concave [bowed outward} when the opportunity cost of producing a good decreases as more is produced III. A PPF is straight when the opportunity cost of producing a good is 0 IV. A PPF is straight when the opportunityr cost of producing a good is constant [/'i ii.1 IV. 6 |., IV. 0 |., III. C. IL. \"I