; and (C) require, with respect to all agreements authorizing expenditure of Federal funds by other organizations, that the organizations receiving the funds make available to the Secretary for audit all records concerning the expenditure of the funds; and (6) encourage by appropriate means economic viability that is consistent with the Corridor. (c) Prohibition on the acquisition of real property The management entity shall not use Federal funds made available under this section to acquire real property or any interest in real property. 6. Corridor management action plan (a) In general Not later than 3 years after the date of enactment of this Act, the Management Entity shall submit to the Secretary for approval a proposed Corridor Management Action Plan for the Corridor. (b) Requirements The Corridor Management Action Plan shall— (1) determine the boundaries of the Corridor adherent to section 4(b); (2) incorporate an integrated and cooperative approach for the protection, enhancement, and interpretation of the natural, cultural, historic, scenic, and recreational resources of the Corridor; (3) take into consideration Federal, State, local, and Tribal plans and treaty rights; (4) include— (A) an inventory of— (i) the resources located in the Corridor; and (ii) any other property in the Corridor that— (I) is related to the themes of the Corridor; and (II) should be preserved, restored, managed, or maintained because of the significations of the property; (B) comprehensive policies, strategies, and recommendations for conservation, funding, management, and development of the Corridor; (C) a description of the actions that the Federal Government, State, Tribal, and local governments, private organizations, and individuals have agreed to take to protect the natural, historical, cultural, scenic, and recreational resources of the Corridor