What is the effect on the graph of f(x) = |x| when the function is changed to g(x) = |3x| + 1? A. The graph is stretched horizontally and shifted up 1 unit. B. The graph is stretched vertically and shifted to the left 1 unit. C. The graph is compressed horizontally and shifted up 1 unit. D. The graph is compressed vertically and shifted to the right 1 unit.​