(a) The picture of 2D honeycomb lattice is given below. Find the primitive lattice vectors a₁ and a2, from the geometry. Assume the vectors are unit vectors or the magnitude of the vector is one. (b) Derive the corresponding reciprocal lattice vectors. (c) Use the reciprocal lattice vectors and draw the first Brillouin zone. (d) Draw the first Brillouin zone using Wigner-Seitz cell in the reciprocal lattice. a2 a₁