For a cubic crystal structure which one of the following relations indicating the cell characterstic is correct?

Options

A. `a != b != c` and `alpha != beta` and `gamma != 90^(@)`
B. `a != b != c` and `alpha != beta = gamma = 90^(@)`
C. `a = b =c` and `alpha != beta != gamma = 90^(@)`
D. `a = b=c` and `alpha = beta = gamma = 90^(@)`

Answer

D