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Q 2682401337.     Which of the following statements are correct?
I. `e // m` ratio of anode rays is not constant.
II. `e // m` ratio of proton rays is not constant.
III. `e // m` ratio of `beta`-particles is constant.
IV. `e//m` ratio of cathode rays is constant.
Choose the correct option.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)