If g(x)=f(1/3x), , which statement is true? A. The graph of function f is stretched vertically by a scale factor of 3 to create the graph of function g. B. The graph of function f is stretched horizontally by a scale factor of 3 to create the graph of function g. C. The graph of function f is compressed horizontally by a scale factor of to create the graph of function g. D. The graph of function f is compressed vertically by a scale factor of to create the graph of function g.