Three observers $A, B$ and $C$ measure the speed of light coming from a source. Observer $A$ moves towards the source,observer $C$ moves away from the source with the same speed,and observer $B$ remains stationary. The surrounding space is a vacuum everywhere. Which of the following is true regarding the measured speeds ${v_A}, {v_B}$ and ${v_C}$?
- A${v_A} > {v_B} > {v_C}$
- B${v_A} < {v_B} < {v_C}$
- C${v_A} = {v_B} = {v_C}$
- D${v_A} = {v_B} > {v_C}$
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