Discussion
Which lubrication regime operates between loaded gear teeth?
Answer: C
The contact pressure elastically flattens the surfaces and raises the viscosity of the oil enormously, forming a very thin but effective film. Boundary lubrication takes over where the film fails, which is where extreme pressure additives act. Understanding the regime explains why oil specification matters so much. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once.
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