What kind of coating should self drilling screws have to avoid corrosion?

Question

I want to know, what kind of coating is required on a self drilling s***w used for metal roofing and cladding, which is exposed to enviromental abuse? the coating should resist corrosion

Answer 1

galvanized screws are the best for corrosion.

Answer 2

option 1: use redoxide first then oil paint-

option 2: use stainless steel screws then no need any coating or color-