What is the effect on the graph of f(x) = x2 when it is transformed to h(x) = 3x2 - 7?
A. The graph of f(x) is vertically stretched by a factor of 3 and shifted
7 units to the right.
B. The graph of f(x) is horizontally compressed by a factor of 3 and
shifted 7 units to the right.
C. The graph of f(x) is vertically stretched by a factor of 3 and shifted
7 units down.
O D. The graph of f(x) is horizontally stretched by a factor of 3 and
shifted 7 units down.