The domain of function r(E(- infty,-7) cup(-7,5) U (5, infty) , and the value of the function approaches 1 as x approaches and . Which function could be function OA B. F(x) = (x - 5)/(x + 7) f(x) = (2x - 35)/(z ^ 2 + 2z - 35) f(x) = (z ^ 2 - 3x - 15)/(z ^ 2 + 2z - 35) f(x) = (x ^ 2 + 2x - 35)/(x ^ 2 - 3x - 15)