Identify the correct statement.

  • A
    Quantum numbers $(n, l, m, s)$ are arbitrary.
  • B
    All the quantum numbers $(n, l, m, s)$ for any pair of electrons in an atom can be identical under special circumstances.
  • C
    All the quantum numbers $(n, l, m, s)$ may not be required to describe an electron of an atom completely.
  • D
    All the quantum numbers $(n, l, m, s)$ are required to describe an electron of an atom completely.

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