What does the ocean floor keep track of magnetic fields

What are magnetic stripes on the ocean floor?

Here is the correct answer of the given question above: The sea floor magnetic field is layered in stripes of alternating north and south polarities. That tells us the polarity of the Earth while that particular stripe was being formed. This is how the ocean floor keeps track of the magnetic field.

b is the correct answer

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the answers would be

the first one and the second one