A) 1s^{2},2s^{2} 2p^{6},3s^{2}3p^{6}3d^{10}, 4s^{2} 4p^{6}4d^{10},
5s^{2},5p^{6} 5d^{6},6s^{2}
B) 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) 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{10}, 4s^{2} 4p^{6}4d^{10}
, 5s^{2}5p^{6}
D) 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{10}, 4s^{2} 4p^{6}4f^{14} ,5s^{2}5p^{6} 5d^{1}