In a compound, atoms of elements $\mathrm{Y}$ form ccp lattice and those of element $\mathrm{X}$ occupy $2/3 \mathrm{rd}$ of tetrahedral voids. The formula of the compound can be

• Correct answer
  A

  ${\mathrm{X}}_4{\mathrm{Y}}_3$
• B

  ${\mathrm{X}}_2{\mathrm{Y}}_3$
• C

  ${\mathrm{X}}_2\mathrm{Y}$
• D

  ${\mathrm{X}}_3{\mathrm{Y}}_4$

Hence, the correct answer is option: 'A'.