A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. What is the formula of the compound?

Question

$\begin{array}{1 1}(A)\;XY&(B)\;X_2Y_2\\(C)\;X_3Y&(D)\;\text{None of these}\end{array} $