Consider a simple neural network composed of a single layer, containing a sigmoid unit with two inputs. Can this network learn to correctly classify the following four data points?

x1 = (0, 0), y1 = 0;

x2 = (0, 1), y2 = 1;

x3 = (1, 0), y3 = 1;

x4 = (1, 1), y4 = 0