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You have a stack of boxes on a flat surface. The bottom box has a mass equal to $M$. The middle box has a mass equal to $2M$. The top box has a mass equal to $3M$.

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Which of the following statements is true according to Newton's third law? Choose TWO answers.


The force of the floor pushing upward on the bottom block equals the sum of the force of gravity acting on the three boxes.


The normal force exerted upward by a bottom box equals the normal force exerted downward by a box immediately on top of it.


The normal force acting exerted upward on the middle block by the bottom block equals the force of gravity pulling down on the middle block.


The pull of gravity on the top block by the Earth equals the upward pull exerted on the Earth by the top block.

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