(I) Cathode rays produce heat, when allowed to fall on matter.
(II) Cathode rays produce X-ray, when allowed to fall on material of high atomic weight.
(III) Cathode rays are positively charged particles
(IV) Cathode rays ionize the gas.

Options

A. I, II and III only
B. I, II and IV only
C. I and II only
D. II, III and IV only

Answer

B