Earlier quoted context omitted.
a) is wrong: users are not connecting directly to PG
Why the silent downvotes. If users do not directly use PG it's not an issue.
"interacting with it remotely through a computer network" may include several hops, the text is unclear at this point. And there is precedent for this interpretation, Microsoft uses the same concept (as "multiplexing") in their SQL Server license terms: https://download.microsoft.com/download/3/D/4/3D42BDC2-6725-... (pdf, from [1], should the document link change in the future).
[1] https://www.microsoft.com/en-us/licensing/learn-more/volume-...