Please choose the correct answer to the question: What statement describes what happens to the carbon dioxide waste produced by a developing baby during pregnancy?

Answer1: It is carried by the umbilical cord to the placenta and then to the mother's blood. Answer2: It is released from the fetus by its breathing and then is absorbed by the placenta. Answer3: It is released through the fetal urine and then exits through the umbilical cord. Answer4: It is carried through shared blood vessels and then to the mother's lungs.

Answer format: answer1/answer2/answer3/answer4