(b) For the purposes of sections one through four of this article, the term "state" means a state of the United States, the District of Columbia, the Commonwealth of Puerto Rico, the Virgin Islands, Guam, the Commonwealth of the Northern Mariana Islands, or a Territory or Possession of or administered by the United States.
(c) For the purposes of sections one through four of this article, the term "adoption assistance state" means the state that is signatory to an adoption assistance agreement in a particular case.
(d) For the purposes of sections one through four of this article, the term "residence state" means the state of which the child is a resident by virtue of the residence of the adoptive parents.