Which of the following can be determined by using the Doppler effect?   I. The speed at which a star is moving away from an observer.   II. The transverse velocity of a star.   III. The radial velocity of a star.   IV. The speed at which a car is traveling toward an observer.   a. I and IV   b. II and III   c. II and IV   d. I and III   e. I, III and IV

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