Answer :
The aeronautical beacon for a lighted heliport flashes with alternating white and green flashes.
This is option B
What is an aeronautical beacon?
An aeronautical beacon is a directional signal transmitted from a fixed location used to indicate the location of an airport, heliport, or other navigationally significant feature. It's usually found on the highest point on an airport or heliport. It's used to alert pilots of the airport's or heliport's location while flying at night, in low visibility, or in inclement weather conditions.
The rotating beacon emits alternating white and green flashes that distinguish heliports from airports with traditional rotating beacons that only emit green flashes. The alternating white and green flashes are the color used for lighted heliports' aeronautical beacons.
So, the correct answer is : b. Alternating white and green flashes.
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