As used in this chapter, the term: (1) “Public agency” means:
(A) Any political subdivision of this state other than a county school district or independent school district;
(B) Any volunteer fire department;
(C) Any volunteer rescue squad;
(D) Any agency of the state government or of the United States; and
(E) Any political subdivision of another state. (2) “State” means a state of the United States.