The crystal structure of $AB$ is of $NaCl$ type. If the radius of the $A^+$ ion is $x \ pm$ and the radius of the $B^-$ ion is $y \ pm$, then the edge length of the unit cell will be ..........
- A$(2x + y) \ pm$
- B$(x + y) \ pm$
- C$2(x + y) \ pm$
- D$(x + 2y) \ pm$
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