Hi, BrightSoul.
I passed the exam in October.
I won't speak to individual CSS rules that are on the exam as this may illegally disclose exam content.
However, I will tell you that vendor prefixes are used in the exam, including those for IE and other browsers.
You will never be asked to choose between vendor prefix of a rule and a standard rule. I believe Microsoft recognized the fact that capabilities change rapidly as new browsers a re released and as standards change.
Good luck!
Best wishes, Davin Mickelson