The ionic radius of $\mathrm{Na}{}^{+}$ is reported as $99\mathrm{pm}$ (coordination number 4), $102\mathrm{pm}$ (CN 6) and $118\mathrm{pm}$ (CN 8). This shows that:

1. Athe radius changes only when the oxidation state changes
2. Bthe effective ionic radius of a cation increases as its coordination number increases
3. Cthe ionic radius is independent of the surroundings
4. Dthe effective ionic radius of a cation decreases as its coordination number increases