[" 72.In the ionic compound "AB" the ratio "r_(A^(+)):r_(B^(-))" is 0.414.Indicate the correct statement of "],[" following: "],[" (a) Cations form close packing and anions exactly fit into the octahedral voids "],[" (b) Anions form close packing and cations occupy precisely half of the tetrahedral voids "],[" (c) Anions form close packing and cations occupy precisely all the octahedral voids "],[" (d) Anions form close packing and cations fit into the octahedral voids loosely "]