It will occur automatically.
Yes. Choosing a strategy it occurs.
there is no rule to choose, you can choose if you really like the answer
One with the highest rating is picked as BA
nope; ep chooses it for you. sometimes it's not the one you wanted as best answer
No, but EP will add up the votes and choose it for you, sometimes, if there's a clear majority.
...no rule...I like to choose best answer since I asked the question...otherwise the answer that gets the most votes gets BA...and sometimes people don't read all the answers...& for me, since I was asking the question I feel a sense of responsibility...but, a few have slipped by & the most votes won. BTW, I tend to ask many questions, & it is diligent work to keep up on the answers...