What Is the Requirement for Child Pornography to Be Classified

What is the requirement for child pornography to be classified as obscene?

A) Any pornographic image of a child, whether actual or virtual.
B) An image of a child considered obscene even if the photo would not be considered obscene if the child was an adult.
C) The image must be considered obscene whether the subject is an adult or child.
D) Only images which unnecessarily harm a child.