For the purposes of this Act, the opinion or state of mind of the Cross - boundary Authority for a State or the Northern Territory is:
(a) if:
(i) the responsible Commonwealth Minister; and
(ii) the responsible State Minister or the responsible Northern Territory Minister, as the case may be;
agree on the matter concerned--the opinion or state of mind of the 2 Ministers; or
(b) if the 2 Ministers disagree--the opinion or state of mind of the responsible Commonwealth Minister.