According to the International 10-20 System, how is the location of the C3 electrode determined?
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A
10% of the head circumference superior to the left preauricular point.
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B
20% of the distance from the nasion to the inion, measured from the nasion.
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C
20% of the distance from the left preauricular point to the right preauricular point.
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D
20% of the nasion-inion distance to the left of the Cz point.