The purposes of this part are—

(a) To ensure that all children with disabilities have available to them a free appropriate public education that emphasizes special education and related services designed to meet their unique needs and prepare them for further education, employment, and independent living;

(b) To ensure that the rights of children with disabilities and their parents are protected;

(c) To assist States, localities, educational service agencies, and Federal agencies to provide for the education of all children with disabilities; and

(d) To assess and ensure the effectiveness of efforts to educate children with disabilities.