Which of the Following Can Be Determined by Using the Doppler

Multiple Choice

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 & IV
B) II & III
C) II & IV
D) I & III
E) I, III, & IV