The correct option is B powder coating
Electrostatic spray deposition is a process involved during powder coating. Powder coating is a method to prevent corrosion in metals.
In this method, a polymer resin, a pigment and some ingredients are melted, mixed, cooled and grounded into a uniform powder. This powder is then sprayed on the metal surface by electrostatic spray deposition (ESD) and the metal is then heated. This results in a formation of a layer that helps in the prevention of rusting.