17. Sodium chloride is a typical example of X structure. It has Y occupying octahedral holes and Z occupying tetrahedral holes.

(A) X=face-centered cubic, Y=Na+ and Cl-, Z=none

(B) X=body-centered cubic, Y=Na+, Z=Cl-

(C) X=face-centered cubic, Y=Na+, Z=Cl-

(D) X=body-centered cubic, Y=Cl-, Z=Na+

(E) None of the above

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