For a tribe to qualify as having lost its government-to-government relationship for purposes of § 292.7, it must show that its government-to-government relationship was terminated by one of the following means:

(a) Legislative termination;

(b) Consistent historical written documentation from the Federal Government effectively stating that it no longer recognized a government-to-government relationship with the tribe or its members or taking action to end the government-to-government relationship; or

(c) Congressional restoration legislation that recognizes the existence of the previous government-to-government relationship.