The function defined by $f(x) = \max \{x^2, (x - 1)^2, 2x(1 - x)\}$ for $0 \le x \le 1$:

  • A
    is differentiable for all $x$.
  • B
    is differentiable for all $x$ except at one point.
  • C
    is differentiable for all $x$ except at two points.
  • D
    is not differentiable at more than two points.

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