In which of the following Aufbau’s principle is violated

Electrons should follow the Aufbau’s rule, Hund’s rule and Pauli’s principle while they are filling in the orbitals.

Electrons get occupy in the orbital which has least energy. Each orbital must accommodate maximum for two electrons.

In 2s 2p have 2s orbital must contain 2 electrons. Then $e^{-}$ should enters into 2p sub-shell.