The function g(x) is a transformation of f(x). If g(x) has a y-intercept at 3, which of the following functions could represent g(x)? A. g(x) = f(x) + 4 B. g(x) = f(x) + 3 C. g(x) = f(x - 3) D. g(x) = f(x - 4)