What is the phenomenon occurring at the rainbow?

reflection, refraction and dispersion
interference
diffraction and refraction
iridescence
A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
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reflection, refraction and dispersion
interference
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iridescence
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