The graph of f(x)=x^2 was transformed to create the graph of g(x) = f(x) -9. Which statement about the graphs is true? A. The graph of g is a reflection of the graph of f across the x-axis.

B. The vertex of the graph of g is 9 units to the right of the vertex of the graph of f.

C. The graph of g is a reflection of the graph of facross the y-axis.

D. The y-intercept of the graph of g is 9 units below the y-intercept of the graph of f.​