Identify the CORRECT statement.

Options

A. Quantum numbers, `(n, l, m_l, m_s)` are obtained arbitarily.
B. All the quantum numbers `(n, l, m_l, m_s)` for any pair of electrons in an atom can be identical under special circumstance
C. All the quantum numbers `(n, l, m_l, m_s)` may not be required to describe an electron of an atom completely.
D. All the quantum numbers `(n, l, m_l, m_s)` are required to describe an electron of an atom completely.