Consider the function f(x) = x2 + 3 and the function g(x) = f(2x) = (2x)2 + 3. how does the graph of g(x) differ from the graph of f(x)?

a. the graph of g(x) is the graph of f(x) compressed vertically by a factor of .
b. the graph of g(x) is the graph of f(x) stretched vertically by a factor of 2.
c. the graph of g(x) is the graph of f(x) stretched horizontally by a factor of 2.
d. the graph of g(x) is the graph of f(x) compressed horizontally by a factor of .