Can you explain the different versions of articles that can be submitted to the WFC?

Here are some definitions of the different versions of articles that might be helpful to you.

Author's Pre-print = working paper

Author's Post-print = the final, post-peer-review version of the article that has been accepted for publication, but not yet copy edited by the journal.

Publisher's Version/PDF = the peer-reviewed, copy-edited version as it appears in the published journal (an exact page image of the article as it appears in print).