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Which electronic configuration is not observing the ($n + l$) rule

• A
  $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^1},\,4{s^2}$
• B
  $1{s^2},\,2{s^2}s{p^6},\,3{s^2}3{p^6}3{d^7},\,4{s^2}$
• ✓
  $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^5},\,4{s^1}$
• D
  $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^8},\,4{s^2}$