1. They are High energy electrons
  2. They are High energy protons
  3. They are Low energy protons
  4. They are High energy electro-magnetic waves
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Option 4 : They are High energy electro-magnetic waves

Gamma rays are the most energetic form of electromagnetic radiation, with a very short wavelength of less than one-tenth of a nanometer. Gamma radiation is the product of radioactive atoms.
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