I am wondering which plan makes the most sense for 200 volunteers to be able to access the site. I will have one Board for all volunteers where updates, important info, adoptions, photos, etc. will be accessed. I'd like to also create a board for cat and dog foster needs. Volunteers really only need the ability to see the lists in the boards and comment on them and upload photos. I am a bit confused between member, vs view only, vs observer. Thank you!