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The Newton-Raphson method fails when O a. f'(x) is too large O b. It never fails c.f'(x) is zero O d. f'(x) is negative Clear my choice When is the Newton-Raphson method not preferred in finding the solution of numerical equation? O a. The graph of f(x) is nearly horizontal O b. The graph of f(x) is vertical O c. None of the choices presented here Od. The graph of f(x) is not parallel