Which of the following statements is true?
1) A line of lobe-finned fishes gave rise to tetrapods, and a line of tetrapods gave rise to modern amphibians.
2) A line of tetrapods gave rise to chordates, and a line of lobe-finned fishes gave rise to tetrapods.
3) A line of amphibians gave rise to tetrapods, and a line of lobe-finned fishes gave rise to modern amphibians.
4) Tetrapods and amphibians evolved at approximately the same time, while lobe-finned fishes evolved 2 million years later.
