Which of the following conditions cause erythroblastosis foetalis?

Mother \({\mathrm{Rh}}^{–\mathrm{ve}}\) and foetus \({\mathrm{Rh}}^{+\mathrm{ve}}\)

Both mother and foetus \({\mathrm{Rh}}^{–\mathrm{ve}}\)

Both mother and foetus \({\mathrm{Rh}}^{+\mathrm{ve}}\)

Mother \({\mathrm{Rh}}^{+\mathrm{ve}}\) and foetus \({\mathrm{Rh}}^{–\mathrm{ve}}\)