Select the correct (s)

If radius ratio $\left({\mathrm{r}}_{\mathrm{c}}/{\mathrm{r}}_{\mathrm{a}}\right)$lies between 0.414 to 0.732 then shape of ionic compound may square planar $\left(\mathrm{Ex}.{\mathrm{PtCl}}_4^{2-}\right)$

If radius ratio is less than 0.155 then shape of compound is linear 

If radius ratio $\left({\mathrm{r}}_{\mathrm{c}}/{\mathrm{r}}_{\mathrm{a}}\right)<0.225$then shape of compound must be linear 

Co-ordination no. of Cs⁺ and Cl^- are 8, 8 in CsCl crystal