Find the x-values (if any) at which the function f(x) = x−4 x2−14x+40 is not continuous. Which of the discontinuities are removable (limit exists) and non-removable? a) x = 4 (Removable), x = 10 (Not removable) b) No points of discontinuity. c) No points of continuity. d) x = 4 (Not removable), x = 10 (Not removable) e) x = 4 (Not removable), x = 10 (Removable)