Save the ship from oxidation

Chemistry Level 1

The above is a galvanic sacrificial anode attached to the hull of a ship, showing corrosion. Cathodic Protection (CP), also referred to as a sacrificial anode, is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. Which of the following metals can protect this ship (iron) from oxidation?

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