Under FAA Part 107, operations over a 'sparsely populated area' with no people present below are treated as:
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A
Requiring a waiver due to potential emergency landings on public roads
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B
Permissible without a waiver as long as no people are in the flight path
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C
Always requiring Notice to Air Missions (NOTAMs)
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D
Prohibited unless a visual observer confirms the area is clear