The definition of obscenity can vary based on legal and cultural contexts, but generally, to define something as obscene, it must meet the following criteria:
•The content is sexual in nature and appeals solely to prurient interests.
•The content lacks any redeeming artistic, literary, or scientific value.
•The content violates prevailing community standards of decency.
Therefore, the options that are necessary to define something as obscene are:
A. Is overtly sexual in nature B. Lacks artistic value C. Violates community standards F. Has nudity
These four options address the sexual nature of the content, its lack of artistic value, its violation of community standards, and the presence of nudity, which can be a significant factor in obscenity cases.