Which of the following is/are ture about HCP and CCP lattice?
A. Number of tetrahedral voids are twice of octahedral holes
B. 12 tetrahedral and 6 octahedral voids are present in one HCP unit cell
C. C.N. of HCP unit cell is 12
D. If atom of tetrahedral voids displace into octahedral voids then it is Schootky defect
