The State plan is a comprehensive statement submitted by the State agency describing the nature and scope of its program and giving assurance that it will be administered in conformity with the specific requirements stipulated in the pertinent title of the Act, the regulations in subtitle A and this chapter of this title, and other applicable official issuances of the Department. The State plan contains all information necessary for the Administration to determine whether the plan can be approved, as a basis for Federal financial participation in the State program.