Which of the following metals can be the most effective sacrificial anode to prevent the oxidation/corrosion of Ni? Standard reduction potential values: Ca+²/Ca: -2.840 V Na+/Na: -2.713 V Ni+2/Ni: -0.257 V H*/H₂: 0.000 V Cu+¹/Cu: +0.520 V Ag+¹/Ag: +0.800 V

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