Please choose the correct answer to the question: Jupiter is the largest planet in the solar system. It rotates on its axis once about every 10 hours. What time period on Earth would be 10 hours long if Earth rotated on its axis once every 10 hours?

Answer1: a day Answer2: a week Answer3: a month Answer4: a year

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