What constitutes a Family Unit (FMU) according to border policy?

The definition of a Family Unit (FMU) according to border policy encompasses an adult and anyone who is under 18 years of age. This broader criterion allows for the inclusion of various relationships and circumstances that can occur within family dynamics, recognizing that not all children are biological offspring of the adult. This definition is critical for the humane treatment of individuals crossing borders, as it provides a framework for processing and protecting minors who may be traveling with guardians or relatives.

The other options do not align with the established definition. An adult and any child under 16 excludes older minors, while children traveling alone do not fit the context of a "family unit." Adult companions without children would not constitute a family unit in this context, as the definition relies on the presence of a minor. Therefore, the correct perspective aligns with the inclusive nature of the term "Family Unit" as it relates to border policy.