Which of the given statements is/are incorrect regarding kidnapping?

I. A parent may be guilty of kidnapping his child if that child has attained majority or has lawfully married under that age. II. In the case of minor girls, Section 361 is attracted irrespective of the question whether she is married or unmarried. III. Consent given by the guardian after the commission of the offence would excuse the offence. IV. If the kidnapped girl turns out be less than 18 years of age, the kidnapper must take the consequences, even though the bona fide believed and had reasonable ground for believing that she was over eighteen.