Electronic configuration of an elements 13x in the subsidiary energy level is

• A.\( 1s^2 2s^2 2p^6 3s^2 3p^1 \)
• B.\( 1s^22s^2 2p^4 3p^1 3s^1 \)
• C.\( 1s^2 2s^2 2p^6 3s^2 3p^3 \)
• D.\( 1s^1 2s^2 2p^6 3s^2 3p^4 \)
• E.