Tetragonal crystal system has the following unit cell dimensions:

Options

A. a = b = c amd `alpha = beta = gamma= 90^(@)`
B. a=b ne c and `alpha =beta = gamma = 90^(@)`
C. `a ne b ne c and alpha = beta = gamma = 90^(@)`
D. `a = b ne c and alpha = beta = 90^(@), gamma = 120^(@)`