Use the following rule set. Slater's rules: write the configuration in groups $(1s)(2s,2p)(3s,3p)(3d)(4s,4p)(4d)(4f)(5s,5p)\dots$ For an electron in an $ns$ or $np$ group, every other electron in the same group contributes $0.35$ ($0.30$ for the $1s$ group), every electron in the $(n-1)$ shell contributes $0.85$, every electron in the $(n-2)$ or lower shells contributes $1.00$, and electrons in groups to the right contribute $0$. For an electron in an $nd$ or $nf$ group, every other electron in the same group contributes $0.35$, every electron in all groups to its left contributes $1.00$, and groups to the right contribute $0$. $Z^{\ast }=Z-S$. For isoelectronic species with the same $n$, the radius is taken to vary as $1/Z^{\ast }$. Both $\mathrm{N}{}^{3-}$ and $\mathrm{Al}{}^{3+}$ are $(1s{)}^2(2s,2p{)}^8$. The predicted ratio $r(\mathrm{N}{}^{3-})/r(\mathrm{Al}{}^{3+})$ is:

1. A1.86
2. B3.11
3. C0.32
4. D2.87