If output is produced according to y = 4L + 6K, the price of K is $15, and the price of L is $12, then the cost-minimizing combination of K and L capable of producing 96 units of output is
a. L = 0 and K = 16. b. L = 20 and K = 12. c. L = 24 and K = 16. d. L = 12 and K = 8. e. L = 24 and K = 0.