The graph below depicts the PPF between tablets and smartphones. You will be asked several questions about this figure. Please respond to these in an essay form. Smartphones (millions per year) 40 A 360 32 28 24 20 2262 16 12 8 4 F C D 2 6 8 E 10 12 Tablets (millions per year) What is opportunity cost of an additional tablet as the economy moves from Point B to Point C? What is the opportunity cost of an additional tablet as the economy moves from point C to point D? What is the opportunity cost of an additional smartphone as the economy moves from Point B to Point A? As more tablets are produced, does the opportunity cost of an additional tablet increase, decrease, or not change? As more smartphones are produced, does the opportunity cost of an additional smartphone increase, decrease, or not change? Characterize point E as attainable or unattainable and, if possible, as production efficient or production inefficient. Characterize point F as attainable or unattainable and, if possible, as production efficient or production inefficient.