(a) There are equal number of octahedral and tetrahedral voids in a unit cell for fcc lattice is incorrect statement. The number of octahedral and tetrahedral void in unit cell for fcc lattice is 4 and 8 respectively. (b) The tetrahedral voids are present at the edge centers is incorrect as they are present on each body diagonal, i.e. diagonal of cubic unit cell. (c) Octahedral voids are present at the body center and edge centers. Statement (c) is correct. (d) Its packing efficiency (PE) is higher than hcp lattice PE is incorrect. The packing efficiency of hcp is 74% and that of fcc is also 74%. It is higher in comparison to packing efficiency of simple cube and bcc which have values 52.4 and 68% respectively.