Guild Wars 2

For the last two months I thought there were 166 players/server/map. I’ve read in forums and other places that it might be different. Are there:

1. 500 players/server/map? 2000 slots available for each server, 6000 total slots.
2. 166 players/server/map? 664 slots available for each server, 1992 total slots.
3. 500 players/server? 500 slots total across all maps, 1500 total slots.
4. 500 players/map? 500 slots total for a map, but team A could have 300 and team B/C have 100 each. 2000 total slots.
5. or something completely different?

I guess 3 and 4 don’t make sense if you can have a queue in EB but none in the borderlands…but still I don’t know.