Which of the following are the correct axial distance and axial angles for rhombohedral system?

Options

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