Which light characteristic has equal durations of light and darkness?

A. Occulting (Oc)
B. Flashing (Fl)
✓ Isophase (Iso)Correct
D. Fixed and Flashing (FFl)

Why C is correct

Isophase (Iso) is specifically defined as a light with equal periods of light and darkness. Occulting has longer light than darkness; Flashing has shorter light than darkness; Fixed and Flashing is a continuous light with a superimposed brighter flash.

Cited:Light List — light-characteristic(Iso)

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Which light characteristic has equal durations of light and darkness? — USCG Exam Practice · CaptainsGround