$A$ solid $A^{+}B^{-}$ has a $NaCl$ type close-packed structure. If the radius of the anion is $250 \ pm$, what should be the ideal radius of the cation in $pm$?

  • A
    $103.5$
  • B
    $250$
  • C
    $78$
  • D
    $56$

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