Which describes the difference between the graphs of f(x) = x4 and g(x) = − 1 3 (x4)? a) the graph of g(x) is obtained by flipping f(x) over the y-axis and shrinking vertically by a factor of 3. b) the graph of g(x) is obtained by flipping f(x) over the x-axis and shrinking vertically by a factor of 3. c) the graph of g(x) is obtained by flipping f(x) over the y-axis and stretching vertically by a factor of 3. d) the graph of g(x) is obtained by flipping f(x) over the x-axis and stretching vertically by a factor of 3