How does Inspire "maximize stiffness"?

I would like to better understand conceptually how Altair Inspire maximizes stiffness in a given 3D part shape when you select that option as the optimization objective and give a mass constraint. As you know even simple rectangular beam shaped parts made of isotropic have different stiffness in different loading directions (see pictures attached for generic reference). So when I select maximize stiffness as my objective on a complex bracket part with multiple loading scenarios, what exactly does Inspire optimize? Is it trying to minimize the generic x , y, z displacements in the global coordinate system across all load cases and see which load case gives a maximum displacement? Or perhaps it tries to minimize the vector magnitude of the maximum displacement across all nodes on the mesh?

It would be helpful to understand what exactly are we doing, so that we can set up the optimization to yield the results/ optimized shapes we would prefer. For example, perhaps you would care more about displacement in a certain axis but don't care about displacement in any other direction.