Which statement describes redshifts?

Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a shorter wavelength.

Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.

Redshifts occur when the light source and observer move closer together, and the light observed shifts to a shorter wavelength.

Redshifts occur when the light source and observer move closer together, and the light observed shifts to a longer wavelength.