Consider the ordered structures, L10 and L12 which are common structures for many two-component metals such as the AuCu system. If the material is quenched (cooled quickly) from the liquid state to room temperature, a random alloy is formed where there is equal probability of finding each atom on a given lattice site in the face centered cubic (FCC) crystal structure. However, if the material is allowed to cool slowly from the liquid state, the ordered phases will form. For only one of the structures, it is possible to redefine the unit cell as a tetragonal unit cell. For which structure is it possible? Explain why this type of redefined unit cell allowed for one crystal structure but not for the other structure. Include a diagram of the new tetragonal unit cell in your answer. What is the Bravais lattice and basis for this redefined unit cell