Which of the following systems is not correctly characterised ?

Options

A. cubic : `a=b=c, alpha=beta=gamma=90^(@)`
B. tetragonal : `a=bnec, alpha=beta=gamma=90^(@)`
C. orthorhombic : `ane bne c, alpha=beta=gamma=90^(@)`
D. rhombohedral : `a=bnec, alpha=beta=gamma=90^(@)`

Answer

D