Which of the following electronic config...

Which of the following electronic configuration is CORRECT for iron?

A

`1s^2 2s^2 2p^2`

B

`1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5`

C

`1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^7`

D

`1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6`

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