Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn²⁺(aq) + 2e⁻ → Zn(s). For a large batch of nails, a manufacturer wants to ensure complete zinc plating. Which of the following actions will ensure the complete plating of zinc?
a) Increase the concentration of Zn²⁺ ions in the solution.
b) Decrease the temperature of the solution.
c) Increase the surface area of the iron nails.
d) Decrease the concentration of Zn²⁺ ions in the solution.