The quantity (in pounds) of a gourmet ground coffee that is sold by a coffee company at a price of p dollars per pound is Q = f(p). (a) What is the meaning of the derivative f ′(5)? What are its units? The rate of change of the quantity of coffee sold with respect to the price per pound when the price is $5 per pound. The units are pounds/(dollars/pound). The rate of change of the price per pound with respect to the quantity of coffee sold when the price is $5 per pound. The units are dollars/pound. The rate of change of the price per pound with respect to the quantity of coffee sold when the price is $5 per pound. The units are pounds/(dollars/pound). The price of the coffee as a function of the supply. The units are pounds. The rate of change of the quantity of coffee sold with respect to the price per pound when the price is $5 per pound. The units are dollars/pound.