The velocity of light emitted by a source $S$ observed by an observer $O$,who is at rest with respect to $S$,is $c$. If the observer moves towards $S$ with velocity $v$,the velocity of light as observed will be
- A$c + v$
- B$c - v$
- C$c$
- D$\sqrt{1 - \frac{v^2}{c^2}}$
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