Which of the following statements correctly compares and contrasts in vitro vs. in vivo fertilization?
1) In vitro and in vivo fertilization occur when an egg is fertilized outside of the body.
2) In vitro fertilization occurs when an egg is fertilized outside of the body, and in vivo fertilization occurs when an egg is fertilized inside of the body.
3) In vitro and in vivo fertilization occur when an egg is fertilized inside of the body.
4) In vivo fertilization occurs when an egg is fertilized outside of the body, and in vitro fertilization occurs when an egg is fertilized inside of the body.