Which of the following methods should be used to dress the face of silver-plated contacts?

Correct Answer: Option C — Sanding with 0000 sandpaper

Silver-plated electrical contacts feature a very thin protective coating. Using files or coarse abrasives destroys this conductive layer. According to IEEE 45 maintenance guidelines, 0000 grade sandpaper must be used to gently clean the contact face without removing the silver plating.