production of widgets (W) uses labor (L) as its only input. The production function is given by W=F(L)=8*L^.5 and the marginal productivity MPL=4/L^.5. If widgets sell for $10, the price of labor is $8/hour, and there is a fixed cost of $25. What is the cost function C(W) for this production technology? choose one of the following: a)C(W)=8W+25 c)C(W)=8*W^2+25 b)C(W)=W^2/8 + 25 d)C(W)=W/8 + 25