(b) Educational service agencies and other public institutions or agencies. The term includes the following:
(1) Educational service agency, defined as a regional public multiservice agency—
(i) Authorized by State law to develop, manage, and provide services or programs to LEAs; and
(ii) Recognized as an administrative agency for purposes of the provision of special education and related services provided within public elementary schools and secondary schools of the State.
(2) Any other public institution or agency having administrative control and direction of a public elementary school or secondary school, including a public charter school that is established as an LEA under State law.
(3) Entities that meet the definition of intermediate educational unit or IEU in section 602(23) of the Act, as in effect prior to June 4, 1997. Under that definition an intermediate educational unit or IEU means any public authority other than an LEA that—
(i) Is under the general supervision of a State educational agency;
(ii) Is established by State law for the purpose of providing FAPE on a regional basis; and
(iii) Provides special education and related services to children with disabilities within the State.