Which of the following overlaps will not result in bond formation?

$d_{xy}-p_x$along y-axis will form a $\pi -$ bond and $p_z-d_{z^2}$   along z-axis will form a sigma bond.  Also, p-orbitals  form sigma bond along their symmetry axis whereas  $d_{zx}$   and $d_{x^2{y}^2}$  do not form any sigma bond with any other  orbital