What transformations change the graph f(x) to the graph g(x) f(x) = 3x^2 g(x) = 9x^2-4 a. the graph of g(x) is the graph of f(x) stretched vertically by a factor of 3 and translated down 4 units b. the graph of g(x) is the graph of f(x) stretched vertically by a factor of 3 and translated up 4 units c. the graph of g(x) is the graph of f(x) stretched vertically by a factor of 1/3 and translated up 4 units