In crystallography, which of the following describes a "face-centered cubic" (FCC) lattice?
1
A lattice with atoms only at the corners of the unit cell.
2
A lattice with atoms at each corner and at the center of each face of the unit cell.
3
A lattice with atoms at the corners and along the edges of the unit cell.
4
A lattice with atoms at the center of the unit cell.