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A teacher uses a stack of six neodymium disk magnets for a demonstration. The stack of magnets causes strong deflection of a compass needle, as shown in the diagram.
What can be properly said about the polarity of the individual neodymium magnets?
The three magnets closest to the compass have only south polarity.
The three magnets closest to the compass have only north polarity.
All six magnets have only south polarity.
All magnets have both north and south polarity, but the south poles are aligned on the side closest to the compass.