Which of the following statement are correct?i)   In octahedral complexes, dz2,dx2−y2  orbitals have higher energy than dxy,dyz  and   dzx orbitalsii)  In tetrahedral complexes, dxy,dyz,dzx orbitals have higher energy than dz2   and    dx2−y2orbitalsiii) The colors of complexes are due to electronic transitions from one set of d-orbitals to another set of orbitals.vi) Δtetrahedral=94Δoctahedral