Explanation:

- Option 1: Tin

- Tin is used in a different process called tin plating, mostly for food cans to prevent corrosion and provide a non-toxic coating.

- Option 2: Aluminium

- Aluminium isn't typically used in galvanization. Instead, it protects metal through a process called anodization.

- Option 3: Zinc

- In galvanization, zinc is deposited on iron to prevent rusting. Zinc acts as a protective layer, sacrificing itself to corrosion and thus protecting the underlying iron.

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- Option 4: Copper

- Copper is not used in galvanization. It is well known for its electrical conductivity and is used in electrical wiring and plumbing.