Ommon Pool Resources Privatization or Collective Action

Identify two common pool resources from the list below, one that seems to be best managed by privatization and another that seems to be best managed through collective action.
o International fisheries
o Aquifers
o Forests
o Atmosphere
o Oil
o Herds of elephants
o Ocean floor mineral deposits in international waters

Why does privatization work better for one, while collective action works better for the other?