Which of the following is the correct set of commands to calculate the central difference approximation of derivative of "f" with respect to x, at x=4? (The correct approximation is stored in variable "answer") O approx - diff(F)./diff(x) answer approx(2) approx = gradient (f)./gradient(x) answer approx(2) approx - gradient(f)./gradient(x) swer= approx(3) approx= gradient(f)./gradient(x) answer approx(4) O None of these

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