I chose the 1-3 option. I consider my ex SO (we're now in the process of splitting up but stil living together) a close friend who understands me. Depending on how things go, it might not stay that way.
Beyond that, I do have one person I talk to sometimes, that I would call a friend, but he doesn't much understand me. We have some things in common and appreciate the occasional company of the other. I do not feel I can confide in him though, it's not that type of interaction we have. More like neither of us have anyone else so we occasionally pester the other for socialization. I don't know if he'd bother with me if he had someone else. I'm not sure.
Most of my socialization is with family members, mostly one daughter and my father.
Does my dog count? He's totes my bff.
Dog is absolutely man's best friend and like a soulmate. Mine passed away it's going on 2 years ago and I will still get an image of her in my mind and a sharp pain in my chest and if I'm alone I will cry like a goddamn baby.