The condition of erythroblastosis foetalis occurs only when

Question

the husband is $Rh^+$ and the wife is $Rh^-$

the husband is $Rh^-$ and the wife is $Rh^+$

the mother is $Rh^+$ and the foetus is $Rh^-$

the mother is $Rh^-$ and the foetus is $Rh^+$

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