Exception?

Chemistry Level 2

What is the full electron configuration of Lanthanum?

(A): 1s22s22p63s23p63d104s24p64d105s25p65d26s1 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 5s^{2} 5p^{6} 5d^{2} 6s^{1}

(B): 1s22s22p63s23p63d104s24p64d105s25p65d16s2 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 5s^{2} 5p^{6} 5d^{1} 6s^{2}

(C): 1s22s22p63s23p63d104s24p64d104f15s25p66s2 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 4f^{1} 5s^{2} 5p^{6} 6s^{2}

(D): 1s22s22p63s23p63d104s24p64d105s25p65d31s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 5s^{2} 5p^{6} 5d^{3}

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