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Indicate the number of unpaired electron...

Indicate the number of unpaired electrons in `K_(3)[Fe(CN)_(6)] and K_(4)[Fe(CN)_(6)] `

A

`{:(K_(3)[Fe(CN)_(6)] ,K_(4)[Fe(CN)_(6)] ),(" "1," "0):}`

B

`{:(K_(3)[Fe(CN)_(6)] ,K_(4)[Fe(CN)_(6)] ),(" "5," "6):}`

C

`{:(K_(3)[Fe(CN)_(6)] ,K_(4)[Fe(CN)_(6)] ),(" "6," "5):}`

D

`{:(K_(3)[Fe(CN)_(6)] ,K_(4)[Fe(CN)_(6)] ),(" "0," "1):}`

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