Which one is not a valid condition for the wave winding?

Which one is not a valid condition for the wave winding? A) Back pitch and front pitch are of the same sign B) Back pitch and front pitch are odd numbers C) Back pitch and front pitch may differ by two and may be equal also D) Commutator pitch is always unity
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Which one is not a valid condition for the wave winding? A) Back pitch and front pitch are of the same sign B) Back pitch and front pitch are odd numbers C) Back pitch and front pitch may differ by two and may be equal also D) Commutator pitch is always unity

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