Which graph represents the function of f(x) = the quantity of 9 x squared minus 36, all over 3 x plus 6?
graph of 3 x plus 6, with discontinuity at 2, 12
graph of 3 x plus 6, with discontinuity at negative 2, 0
graph of 3 x minus 6, with discontinuity at negative 2, negative 12
graph of 3 x minus 6, with discontinuity at 2, 0