New Weapons Talents Buffs Question

I am trying to understand the new weapons in order to make decisions the first days after the update.

Reading the blog of the devs and watching some videos from testers, I see all the weapons have a Primary and Secondary Buff Talent, and some of the available options are »You have 1 additional point of held Def/Vita/Speed/etc.»

For example, considering the Living Branch with an unlocked and selected Talent Primary Buff of «+1 held Vitality». What does that exactly mean?:

1. Whenever I gain a temporary Vitality buff, I retain 1 Vitality buff at the end of the duration
2. Whenever I gain a temporary Vitality buff, I gain 1 extra Vitality buff
3. As long as I am actively wielding that weapon, I have a constant +1 Vitality buff
4. As long as I have equipped that weapon, I have a constant +1 Vitality buff
5. Other

If any dev or tester can bring some light, that could help with further decisions.

Thanks in advance