Identify the Correct Statement:
A) in an Octahedral Crystal Field $\Delta$

Identify the correct statement:

A) In an octahedral crystal field, the d orbitals are split into t_2g and e_g sets separated by the ligand-field splitting parameter $\Delta$ _O.
B) The triply degenerate t_2g set is higher in energy than the doubly degenerate e_g set in an octahedral crystal field.
C) The e_g set of orbitals is composed of degenerate d_xy and d_xz atomic orbitals.