Trying to correct your answer to the question without reading the article. If the Sun would only emit one wavelength, you'd need an artificial light source to

Trying to correct your answer to the question without reading the article. If the Sun would only emit one wavelength, you'd need an artificial light source to get white (R+G+B) light. The answer white is correct in regards of the visible light spectrum. But you need to add infrared and UV to it. Red and blue shift is relevant for objects that move relatively to us observers. E.g. other stars within our galaxy, or galaxy relative to other galaxies. Since we orbit the sun relatively slowly you won't notice significant red or blue shift here.