WikiAnswers uses all three, but "ok" (the third example) is an example of poor punctuation, so the other two are preferred.
ok
OK. okay,kk
Unfortunately, no, but you can use okay.
OK is d'accord. OK OK is OK OK
No, OK is actually an abbreviation. The word "KO" is acceptable though.
You can use; ok, o.k., okey '
are you ok
OK
It means absolutley awsome it means okay
The correct way to say it is Okay which is how I usually write it.
there was never a miss ok or miss okay
OK is short for okay