Li₂O Crystallises with the Antifluorite Structure Where the Positions of the Cations

Li₂O crystallises with the antifluorite structure where the positions of the cations and anions are in the opposite positions to the structure observed for fluorite. What are the coordination numbers of the lithium and oxygen ions?

A) Lithium is four coordinate and oxygen is six coordinate.
B) Lithium is four coordinate and oxygen is eight coordinate.
C) Lithium is eight coordinate and oxygen is four coordinate.
D) Lithium and oxygen are both six coordinate.