The term “homeless children and youth”— A. means individuals who lack a fixed, regular, and adequate nighttime residence…; and B. includes — i. children and youths who are sharing the housing of other persons due to loss of housing, economic hardship, or a similar reason; are living in motels, hotels, trailer parks, or camping grounds due to the lack of alternative adequate accommodations; are living in emergency or transitional shelters; or are abandoned in hospitals; ii. children and youths who have a primary nighttime residence that is a public or private place not designed for or ordinarily used as a regular sleeping accommodation for human beings…; iii. children and youths who are living in cars, parks, public spaces, abandoned buildings, substandard housing, bus or train stations, or similar settings; and iv. migratory children…who qualify as homeless for the purposes of this subtitle because the children are living in circumstances described in clauses (i) through (iii)