If light from a source known to be emitting blue light is observed to be redshifted, what does this imply about the relative motion between the source and the observer?

The source and observer are moving towards each other.

The source and observer are moving away from each other.

The source and observer are stationary relative to each other.

The observer has a form of color blindness.

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If light from a source known to be emitting blue light ... | Physics MCQ #91 | Examora | Examora