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What is the oxidation number of the central metal ion in each of the following complexes or compounds? A. [NiCl2F2]^2- B. [Fe(H2O)4(NH3)2]^3+ C. Na[Au(CN)2] Express the oxidation numbers numerically, in the order that the complexes are listed, separated by commas. For a nonzero oxidation number, be sure to include the sign (e.g., +1, -2, +3).