# The ionic radii of $R{b}^{+}$ and $B{r}^{-}$ ions are 1.47 $\stackrel{°}{A}$ and 1.95 $\stackrel{°}{A}$, respectively. The most probable type of geometry exhibited by RbBr on the radius ratio rule is

NaCl type

CsCl type

Zinc blende structure

Wurtzite structure

Please do not use chat terms. Example: avoid using "grt" instead of "great".