1. O: have the different opinion, they basically will not remain silent, no matter how boring it's advice, no matter how high status in each other, they will call a spade a spade.
2. B: they do not care what other people think, so they can freely express to anybody, but type B people are not good at this point of view in front of many people.
AB: the most care about interpersonal relationship harmony, tend to consider before blunt his opinion "if I say, can bring what kind of impact to our relationship".
4. Type A: careful, do things paranoid type A person, even though there are A lot of ideas, also can't express it well, because they are afraid of people object to.