Please choose the correct answer to the question: Lisa was hiking in a rocky area and in a rock, she saw what looked like footprints made by a bird. But weirdly, they were in a rock. Where did they come from?

Answer1: The footprints were originally in mud or peat, but after a lot of time, the substance had been changed into rock Answer2: The rock was actually an asteroid Answer3: a very heavy bird made imprints in the rock. Answer4: a spaceship used a laser to make the etches in the rock

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