Let ƒ be any function continuous on [a, b] and twice differentiable on (a, b). If for all x ∈ (a, b), ƒ'(x) > 0 and ƒ''(x) < 0, then for any c ∈ (a, b), (f(c) - f(a))/(f(b) - f(c)) is greater than:
(1) (b + a)/(b -a)
(2) (b - c)/(c - a)
(3) (c - a)/(b - c)
(4) 1