Please choose the correct answer to the question: Frank needs to move a box by sliding it across the floor. Which two factors will most strongly affect how hard Frank needs to push the box?

Answer1: The density of the box material and the hardness of the floor Answer2: The thickness of the box material and the hardness of the floor Answer3: The total mass of the box and the friction between the box and the floor Answer4: The total height of the box and the distance between his hands and the floor

Answer format: answer1/answer2/answer3/answer4
Answer: answer3