What 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, alpha = beta = gamma = 90^(@) `
D. ` a ne b ne c, alpha = beta = gamma ne 90^(@)`

Answer

A