Wiglets affect both form drag and which other type of drag?

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Multiple Choice

Wiglets affect both form drag and which other type of drag?

Explanation:
Wiglets modify surface flow, affecting how pressure builds up over the surface and how lift is distributed along the wing. Because pressure differences around the surface drive form drag, wiglets change this pressure distribution and thus form drag. They also influence the lift distribution and the associated wingtip vortices, which determine induced drag; by altering boundary-layer behavior and lift spread, wiglets can change the strength and structure of those vortices, affecting induced drag. The effect is not primarily about skin-friction (parasite) drag in this context, so the key pair is form drag and induced drag.

Wiglets modify surface flow, affecting how pressure builds up over the surface and how lift is distributed along the wing. Because pressure differences around the surface drive form drag, wiglets change this pressure distribution and thus form drag. They also influence the lift distribution and the associated wingtip vortices, which determine induced drag; by altering boundary-layer behavior and lift spread, wiglets can change the strength and structure of those vortices, affecting induced drag. The effect is not primarily about skin-friction (parasite) drag in this context, so the key pair is form drag and induced drag.

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