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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.

A

I, II and III

B

I, III and IV

C

II, III and IV

D

I, II and IV

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