The correct options are
B 8 faces
D 12 edges
In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a platonic solid composed of eight equilateral triangles, four of which meet at each vertex. A regular octahedron (as shown in the figure) is the dual polyhedron of a cube.
Hence, the correct options are B and D