KCl has the NaCl type structure which is fcc with two-atom basis, one at (0,0,0) and the other at (1/2,1/2,1/2). Assume that the atomic form factors of K* and Clare identical. In an X-ray diffraction experiment on KCl, which of the following (hkl) peaks will be observed? (a) (100) (b) (110) (c) (111) (d) (200)