The ionic radii of $Rb^+$ and $I^-$ are $1.46 \ \overset{o}{A}$ and $2.16 \ \overset{o}{A}$ respectively. Which type of crystal structure is possible?
- A$CsCl$ type
- B$NaCl$ type
- C$ZnS$ type
- D$CaF_2$ type
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