A firm has fixed costs of $2000. It's short production function is , where x is the amount of variable factor it uses. The price of the variable factor is $3000 per unit. The short-run production function is:

a. TC = 5000y

b. TC = 2000 + 3000y

c. TC = 2000/y

d. TC = 2000 +

e. TC = 2000y +

y = 42.12