Which of the following conditions is not correct for the formation of molecular orbitals by LCAO?

${\mathrm{p}}_{\mathrm{x}}$ atomic orbital can form $\mathrm{\pi }$-molecular orbital by combining with ${\mathrm{p}}_y$ atomic orbital.

Combining orbitals must have the same or nearly same energy.

The combining atomic orbitals must overlap partially but to the maximum extent.

The combining atomic orbitals must have the same symmetry about the molecular axis.