7.The cost function of Animal Across Co. is c(w1, W2, y). w1 and w2 are the wage of factor 1 (X1) and factor 2 (X2), respectively； y is output level. If Animal Across Co.'s production function is y(X1, X2) = Max(4X1, 5X2), what is the exact cost function of this company?
(A) y*(w1/4+w2/5)
(B) y*Min(w1/4, w2/5)
(C) y*(w1/5 +w2/4)
(D) w1/4 +w2/5
(E) y*Max(w1/4, w2/5)
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