PvE Ladder Boss Fights entry for Guilds

hello people of Warmane,

I was wondering how many people are needed in for example 10Man anub kill to get credit for PvELadder on Guild Boss Fight Armory Site? Becouse I have seen some Guilds getting Kills for Bosses with some mixed people from others Guilds on the Armory. How many people? 6 min needed? 7? 8?

Sorry for bad english, its not my native language.
I did not find any useful information on the Search function, sorry If I somehow missed it

Thank u in advance and have a nice week

No GM answer?

pls men