Let ƒ : [0, 2] → R be a twice differentiable function such that ƒ''(x) > 0, for all x ∈ (0, 2). If ϕ (x) = ƒ(x) + ƒ(2 – x), then ϕ is -
(1) increasing on (0, 2)
(2) increasing on (0, 1) and decreasing on (1, 2)
(3) decreasing on (0, 2)
(4) decreasing on (0, 1) and increasing on (1, 2)
