  In this brief paper, starting from recent works, we analyze from conceptual
point of view this basic question: can the nature of quantum entangled states
be interpreted ontologically or epistemologically? According to some works, the
degrees of freedom (and the tool of quantum partitions) of quantum systems
permit us to establish a possible classification between factorizable and
entangled states. We suggest, that the "choice" of degree of freedom (or
quantum partitions), even if mathematically justified introduces an epistemic
element, not only in the systems but also in their classification. We retain,
instead, that there are not two classes of quantum states, entangled and
factorizable, but only a single class of states: the entangled states. In fact,
the factorizable states become entangled for a different choice of their
degrees of freedom (i.e. they are entangled with respect to other observables).
In the same way, there are no partitions of quantum systems which have an
ontologically superior status with respect to any other. For all these reasons,
both mathematical tools utilize(i.e quantum partitions or degrees of freedom)
are responsible for creating an improper classification of quantum systems.
Finally, we argue that we cannot speak about a classification of quantum
systems: all quantum states exhibit a uniquely objective nature, they are all
entangled states.
