Discussion
What does thermal compound at the mounting interface do?
Answer: C
Two nominally flat surfaces touch only at a few points, and air is a poor conductor, so a thin film of compound displaces it and cuts the interface resistance substantially. Electrical insulation is the washer's job, not the compound's, the internal path is unaffected, and corrosion is incidental. A thin film is essential and a thick one is worse than none, since the compound itself conducts far less well than metal - which is why it is spread rather than applied generously.
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