Identify the three-dimensional primitive lattice that satisfies the property below: 
Has an internal angle of 120°C and is equal on two dimensions. 


(i) tetragonal
(ii) rhombohedral 
(iii)  triclinic
(iv) orthorhombic
(v) hexagonal
(vi) monoclinic

• A. i only
• B. ii and iii
• C. iv and v
• D. v only
• E. vi only

Answer: (D)