Which of the following statement$(s)$ is/are correct?

  • A
    The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons.
  • B
    In nuclear fission,energy is released by fragmentation of a very heavy nucleus.
  • C
    In nuclear fusion,energy is released by fusing two nuclei of medium mass (approximately $100 \, a.m.u.$).
  • D
    Both $(a)$ and $(b)$.

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