The graph of f(x) =x2 was transformed to create the graph of g(x) = f(x) -9. which statement about the graph 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 f across the y-axis
D. The y-intercept of the graph of g is 9 units below the y-intercept of the graph of f.