Project Hierarchy - where to put class info

Hello!

Im working on multiplayer game, gameplay is almost done, the main concept is that Player can choose one of 3 classes = for example Rouge, Warrior, Wizard, and each class have a level progression, the problem is - where to store/put a information about each class leve? Player State? Game Instance? Where you put this type of data that need to be persistent?

Thanks in Advance!