What type of crystal defect is indicated in the diagram below? Na$$^+$$ Cl$$^-$$ Na$$^+$$ Cl$$^-$$ Na$$^+$$ Cl$$^-$$ Cl$$^-$$ $$\square$$ Cl$$^-$$ $$\square$$ Na$$^+$$ $$\square$$ Na$$^+$$ Na$$^+$$ Cl$$^-$$ $$\square$$ Cl$$^-$$ Na$$^+$$ Cl$$^-$$ Cl$$^-$$ Na$$^+$$ Cl$$^-$$ Na$$^+$$ $$\square$$ Na$$^+$$

A

Frenkel defect

B

Frenkel and Schottky defects

C

Interstitial defect

D

Schottky defect