Let f(x) be defined in [–2, 2] by f(x) = {max √(4 - x2) , √(1 + x2) -2 ≤ x ≤ 0 f(x) min √(4 - x2) , √(1 + x2) , 0 < x ≤ 0 then f(x)
(A) is continuous at all points
(B) is not continuous at more than one point
(C) is not differentiable only at one point
(D) is not differentiable at more than one point.