80. By what means is electric current conveyed to the electric drive motor of a podded propulsor?

Current is conveyed from the source to a set of stationary brushes, then through a single rotating slip ring and then on to the motor windings.
Current is conveyed from the source to a set of stationary slip rings, then through a set of rotating brushes and then on to the motor windings.
Current is conveyed from the source to a set of stationary brushes, then through a set of rotating slip rings and then on to the motor windings.
Current is conveyed from the source to the stator of a synchronous transmitter, and by synchro action to the rotor of a synchronous receiver.

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