Which of the following electron configur...

Which of the following electron configurations is correct for iron,(atomic number26)?

A

[kr]`4s^(1)3d^(6)`

B

[kr]`4s^(1)3d^(7)`

C

[Ar]`4s^(2)3d^(6)`

D

[kr]`4s^(2)3d^(6)`

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