The correct answer is option 1 i.e Red
Red color has the highest wavelength and shortest frequency. Violet color has the shortest wavelength and highest frequency.
As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength.
Violet has the shortest wavelength, at around 380 nano meters, and red has the longest wavelength, at around 700 nano meters.