Astronomers may describe certain objects as being redshifted or blueshifted. Select all true statements about this phenomenon from those listed below. Choose one or more: A. Wavelengths of light from the objects differ from expected (rest) wavelengths because the object is moving away from (blueshifted) or toward (redshifted) the observer. B. The objects radiate primarily red or blue light, respectively, in the visible spectrum. C. Wavelengths of light from the objects differ from expected (rest) wavelengths because the object is moving away from (redshifted) or toward (blueshifted) the observer. D. These objects are exhibiting the Doppler effect