Correct statement(s) among the following is/are

The atomic orbitals in the valence shell of an atom with unpaired electrons only participate in hybridization.

A $\pi -bond$ is formed by sidewise overlapping of two orbitals which have their axes  parallel to each other.

The sigma $\left(\sigma \right)$ bond strength of different orbitals overlapping will be in the order  $2S-2 S>2S-2P >2P-2P$

$B{F}_3$ is more covalent than  $Be{F}_2$