The crystal system of a compound with unit cell dimension, a = 0.387 nm, b = 0.387 nm, c = 0.504 nm and α = β = 90o and γ = 120o is
Cubic
Orthorhombic
Hexagonal
Rhombohedral
The characteristic of hexagonal crystal system is a = b ≠ c, α = β = 90o , γ =120o