According to 14 CFR Part 139, what is the minimum frequency for conducting a self-inspection of the airfield for a certificated airport?
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A
Weekly, with additional inspections after unusual weather events.
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B
Daily, and also at night if the airport serves air carriers during hours of darkness.
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C
Twice daily, once during the day and once at night.
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D
Only after an aircraft accident or incident has occurred.