The fifth derivative of a function f is calculated at N 1 regularly spaced points using first-order accurate finite differences at the first respective last data point, and second-order accurate finite differences everywhere else. b) If round-off errors dominate, what is the observed order of the infinity norm of the derivative error when N is successively doubled? Group of answer choices -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6