$CsBr$ has a $bcc$ structure. If the edge length is $4.3 \ \overset{\circ}{A}$,what is the minimum distance between $Cs^+$ and $Br^-$ ions in $\overset{\circ}{A}$?
- A$0.897$
- B$3.72$
- C$1.947$
- DNone of these
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