Which of the following pairs of $d$ -orbitals will have electron density along the axis?

$d$ -orbitals are classified into two groups:t2g (Non-axial): $d_{xy},d_{yz},d_{xz}$ have lobes in between the axes.eg (Axial): $d_{x^2-y^2}$ has lobes along the $\text{x}$ and $\text{y}$ axes. $d_{z^2}$ has lobes along the $\text{z}$ axis.Thus, the pair with electron density along the axis is $d_{z^2},d_{x^2-y^2}$.