Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R). 

Both (A) and (R) are true and (R) is the correct explanation of (A)

In an octahedral complex, the ligands approach the central metal ion along the Cartesian axes. The repulsion between the ligand electrons and the d electrons of the metal ion leads to the energy splitting of the d orbitals. This splitting can be visualized as a set of three orbitals with lower energy and two orbitals with higher energy.

The three orbitals with lower energy, often labeled as d_xy, d_yz, and d_zx, are stabilized by the electrostatic interactions with the ligands. These orbitals have less overlap with the approaching ligands and experience less repulsion, resulting in lower energy.

 The two orbitals with higher energy, often labeled as d_x²-y² and d_z², have greater overlap with the approaching ligands and experience more repulsion, leading to higher energy. These orbitals have more elongated shapes along the axes pointing towards the ligands.