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What type of crystal defect is indicated...

What type of crystal defect is indicated in the diagram given below
`{:(Na^(o+),Cl^(ɵ),Na^(o+),Cl^(ɵ),Na^(o+),Cl^(ɵ)),(Cl^(ɵ),square,Cl^(ɵ),Na^(o+), square, Cl^(ɵ)),(Na^(o+),Cl^(ɵ),square,Cl^(ɵ),Na^(o+),Cl^(ɵ)),(Cl^(ɵ),Na^(o+),Cl^(ɵ),Na^(o+),square,Na^(o+)):}`

A

Frenkel defect

B

Schottky defect

C

Interstitial defect

D

Frenkel and Schottky defect.

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