Which drag component is the frictional resistance along the wing surface labeled as?

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Multiple Choice

Which drag component is the frictional resistance along the wing surface labeled as?

Explanation:
Friction along the wing surface is profile drag. This is the skin-friction component that arises from air sticking to and shearing past the wing as it moves through the air—the viscous resistance in the boundary layer. This drag is part of the surface-related, or parasite, drag category, separate from induced drag (which comes from lift and wingtip vortices) and from form drag (pressure differences due to shape). So the frictional resistance along the wing is the profile (skin-friction) drag.

Friction along the wing surface is profile drag. This is the skin-friction component that arises from air sticking to and shearing past the wing as it moves through the air—the viscous resistance in the boundary layer. This drag is part of the surface-related, or parasite, drag category, separate from induced drag (which comes from lift and wingtip vortices) and from form drag (pressure differences due to shape). So the frictional resistance along the wing is the profile (skin-friction) drag.

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