When the polynomial function g is graphed in the xy-plane such that y = g(x), it passes through the points (6, 0), (7, 0), and (0, 13). Which of the following must be true?
I. When g(x) is divided by (x - 6), the remainder is 0.
II. The point (7, 0) is an x-intercept of the graph of y = g(x).
III. When g(x) is divided by (x - 13), the remainder is 0.