Wrenches that are recommended for use on gas turbine engines should be plated with which of the following elements?

Correct Answer: Option B — Nickel

Nickel plating is the industry standard for gas turbine maintenance tools because it provides a durable, corrosion-resistant surface that is less prone to flaking than other coatings. This minimizes the risk of foreign object damage (FOD) within the engine, ensuring that no metallic contaminants enter the gas path during maintenance.