103. Concerning the method for the reversal of rotation of a DC propulsion motor, what statement is true?

The only possible method of reversal of rotation direction is by reversing the polarity of the field by reversing the field current direction. No other method is possible.
The only method of reversal of rotation direction is by reversing the polarity of the field by reversing the field current direction AND by reversing the polarity of the armature by reversing the armature current direction SIMULTANEOUSLY.
The only possible method of reversal of rotation direction is by reversing the polarity of the armature by reversing the armature current direction. No other method is possible.
The methods of reversal of rotation direction are by EITHER reversing the polarity of the field by reversing the field current direction OR by reversing the polarity of the armature by reversing the armature current direction.

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