The magnitude of the truncation error for the scheme f'(x) = Af(x) + Bf(x + h) +Cf(x + 2h) is equal to
1
h2f'''(ξ) if A = -\(\frac5{6h}\), B = \(\frac3{2h}\), C = -\(\frac2{3h}\)
2
h2f'''(ξ) if A = \(\frac5{6h}\), B = \(\frac3{2h}\), C = \(\frac2{3h}\)
3
h2f''(x) if A = -\(\frac5{6h}\), B = \(\frac3{2h}\), C = -\(\frac2{3h}\)
4
h2f''(x) if A = \(\frac5{6h}\), B = \(\frac3{2h}\), C = \(\frac2{3h}\)