A competitive firm has a long-run total cost function c(y) = 2y2 + 288 for y > 0 and c(0) = 0. Its long-run supply function is described as: . a. y = p/2 if p > 46, y = 0 if p < 46. b. y = p/2 if p > 53, y = 0 if p < 43. c. y = p/2 if p > 51, y = 0 if p < 54. d. y = p/4 if p > 48, y = 0 if p < 48. e. y = p/4 if p > 51, y = 0 if p < 51..