In the United States, public land is defined as the terrains within a nation that are held in trust by the government in benefit of the residents of said nation. The control and administration of these lands, which really belong to the people at large, fall on the hands of the government at the federal, state, city and county levels. As such, agencies like the Bureau of Land Management, the United States National Park Service, among other institutions, are entrusted with all the details pertaining to management and administration of these public lands. From all the options given in this question, the one that is NOT true concerning the use of public land is B, unprotected lands exist inside federal parks. This is because almost from the beginning, it was established that be it through purchase or through forceful taking, or settlement, lands that are established as a monument, meaning, establishing a park, especially at the federal level, are under the protection of the government.