Discussion
Which component supplies current to the rotating field winding?
Answer: A
Two slip rings and small carbon brushes carry the field current, and because there is no reversal they need no segmentation. Brushless alternators using a stationary field genuinely exist, which makes the last option a real if uncommon arrangement. The shared behaviour explains why these belong together and the differences explain why both exist. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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