The correct answers are 1, 3, 4, and 5. Yellowstone National Park, as its name implies, is managed by the federal government; air traffic controllers are federal employees as well. 1, 3, 4 and 5, on the other hand, are the responsability of state and city governments.
It was a new way to solve problems and do research.
Someone who authorizes another to act as an agent is known as a principal. Hope this helps!
