Question If f x 3 and g x O f g x Select the correct answer below O f g x O f g x O f g x O f g x O f g x 12x 9 x 6 x 3 9 26 find f g x and determine any domain restrictions x 6 6 x 6 x 3 6x 45 x 6 x 3 where x3 6 6x 45 x 6 x 3 where x 3 6 6 x 6 x 3 where x 3 6 12x 9 x 6 x 3 where x3 6 where x 3 6 where x 3 6