Ok it looks like I am back on my soap box. This is another one of those questions that actually does not have a right answer given. This is not a microsoft exam where you choose the best answer. What the H E double hockey sticks is going on with these questions.
While it is expected behavior, that is not completely the right answer as given in the support site. I did know that according to microsoft this was the intended behavior but others that choose parallelism is not totally out of the question. Ascync IO, not totally wrong. This should have been choose which apply.
Coooooommmmmmmeeeeee ooooooooonnnnnnnnnn. I mean WTF. Ya see I am black and white kind of guy. Were any of the answers totally right or totally wrong... nope. Read the article.:D
The more you help the business, the more they will help you...well sometimes anyway.