Which one of these electron configurations is a violation of the Pauli exclusion principle? Orbital group of answer choices A, B, C, D, E.
A) 1s² 2s² 2p⁶ 3s²
B) 1s² 2s² 2p⁶ 2d¹⁰
C) 1s² 2s² 2p⁶ 3s² 3p⁶
D) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰