The legal definition of an Indian child includes which of the following?

The legal definition of an Indian child is primarily based on the individual's membership in a tribe. This means that for a child to be recognized as an "Indian child" under specific federal and state laws, such as the Indian Child Welfare Act (ICWA), they must either be a member of a federally recognized tribe or eligible for membership in a tribe. This condition emphasizes the importance of tribal affiliation and acknowledges the unique status of these children as part of their culture and community.

The other options presented do not conform to the legal definition of an Indian child. For instance, the stipulation regarding age does not reflect the criteria, as the legal age limit for classification is typically under 18 years, not 21. Additionally, being enrolled in school is not a requirement for defining an Indian child; many children may not be in school for various legitimate reasons. Lastly, there is no prerequisite concerning the status of the child's parents for defining an Indian child. The emphasis remains solely on tribal membership or eligibility.