Option (1) is incorrect: A man is said to commit rape who has sexual intercourse with a woman with or without her consent, when she is under sixteen years of age.
Option (2) is incorrect: Penetration is sufficient to constitute the sexual intercourse necessary to the offence of rape.
Option (3) is incorrect: Sexual intercourse by a man with his own wife, the wife not being under fifteen years of age, is not rape.
Option (4) is correct: Death penalty is never awarded under the offence of rape.