The answer is C ms-dos
Side note:
GUI means graphical user interface. In other words, that means it looks pretty and has cool buttons, animations and cute stuff. MS-DOS is just a black screen with words on it. Definitely not cute or cool.
Answer:
The answer is Frequency Spectrum.
Explanation:
The frequency spectrum is range of all component frequencies.It contains all the waves which are as following:-
Gamma Rays
X-Rays
Ultraviolet
Visible light.
Infrared
Micro wave
Radio wave
These all waves have their range of frequencies.The waves that are visible to us is only the visible light.