Which electron configuration represents a violation of Hund's rule for an atom in its ground state?

Name: Which electron configuration represents a violation of Hund's rule for an atom in its ground state?
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Hund's rule states that for degenerate orbitals, electrons will fill them singly before pairing up. In option D, there is a violation of Hund's rule because one orbital (3d) has two electrons before all of the other orbitals have at least one electron. In all other options, Hund's rule is followed.

Which Electron Configuration Represents a Violation of Hund's Rule for an Atom