First of all, let's regroup your sentences. 1) The ones with "which" are not possible. You are not saying what kind of posts they are ( submitted posts ), so the relative clause construction (a modifier) is not appropriate.
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First of all, let's regroup your sentences.
1) The ones with "which" are not possible. You are not saying what kind of posts they are (submitted posts), so the relative clause construction (a modifier) is not appropriate. "submit" is much more an action here, not a description. "submit" is the action you don't want to see. Consequently, none of the following are