The agency may delegate its functions or powers under this Act to—
(a) the board; or
(b) a member of the board; or
(c) the chief executive officer; or
(d) an appropriately qualified employee of the agency; or
(e) an appropriately qualified person who performs work for the agency under a contractual or other arrangement; or
(f) an appropriately qualified employee of an entity that performs work for the agency under a contractual or other arrangement.