The cubic unit cell structure of a compound containing cation M and anion X is shown below. When compared to the anion, the cation has smaller ionic radius. Choose the correct statement(s).
(A) The empirical formula of the compound is MX.
(B) The cation M and anion X have different coordination geometries.
(C) The ratio of M-X bond length to the cubic unit cell edge length is 0.866.
(D) The ratio of the ionic radii of cation M to anion X is 0.414.
