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Which axis undergo shifting as a result of armature reaction?

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Which axis undergo shifting as a result of armature reaction?

(a) GNA

(b) MNA

(c) Both GNA and MNA

(d) Remains fixed

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This key question is from Armature Reaction in section Armature Reaction of DC Machines

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The correct answer is (b) MNA

To elaborate: Apart from distortion of the resultant flux density wave, its MNA also gets shifted from its GNA by a small angle α so that the brushes placed in GNA are no longer in MNA as is the case in the absence of armature current.

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