In the context of maximizing the area A of the enclosure, what dimensions (values of x and y) should the farmer choose for the pens? Assume x is the length and y is the width. a) x = 44 ft, y = 0 ft b) x = 22 ft, y = 22 ft c) x = 20 ft, y = 24 ft d) x = 30 ft, y = 19 ft