3. Output is produced according to Q = 4L+6K, where L is the quantity of labor input and K is the quantity of capital input. If the price of K is $12 and the price of L is $6, then the cost minimizing combination of K and L capable of producing 60 units of output is:

A) L = 5 and K = 6.66

B) L = 7.5 and K = 5

C) L = 6 and K = 6

D) L = 0 and K = 10

E) L = 15 and K = 0