Let f be a function in C (R), infinitesimal as x + 0 and with a minimum point at x =0. Then necessarily %3D O (A)f(x) = h+ kx² + o(x²), h, k E (0, +0) O (B) f(x) = kx² + o(x²), ke (0, +o0) O (C)f(x) = kx* + o(x*), kE (0, +o0) O (D) f'(0) = 0, and f'(x) 20 %3D %3D O (E) the smallest order of the derivative that is non-zero at x = O is even

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