Consider the graph of function f below. A diagonal curve rises through the points (negative 10, negative 4), (negative 6, 0), (negative 4, 2), (0, 6), (2, 8), (4, 10) and (6, 12) on the x y coordinate plane. The function g is a transformation of f. If g has a y-intercept at 4, which of the following functions could represent g?