For a tetrahedral complex of a metal in the first transition series, which of the following statements concerning energies of the 3d orbitals is correct?
(a) The five d orbitals have the same energy.
(b) The d_x²_−y² and d_z² orbitals are higher in energy than the d_xz, d_yz, and d_xy orbitals.
(c) The d_xz, d_yz, and d_xy orbitals are higher in energy than the d_x²_−y² and d_z² orbitals.