As Mechanical Engineer, you are required to investigate the safety of a simple structure subjected to a load $P$ as depicted in the figure below:

The structure consists of two solid cylindrical steel rods $AB$ and $BC,$ having a diameter of $50mm.$ The elastic modulus of steel is $200$GPa. The rods are pinned connected. Furthermore, the joint $B$ is restrained from any translation along the $z-$direction.

To ensure its safety, a minimum safety factor of $3$ against possible buckling is required for each rod. If the applied load $P=60kN,$ investigate whether the safety requirement is met.