Andrew Fitzgerald (12/13/2007)
MS On-line help for SQL lists three Types of DML triggers: After, Instead of and CLR.
Tempted as I now am to submit a documentation bug report, I can't deny that this is indeed exactly what Books Online says. I disagree with it (but that's not new, I disagree with lots of stuff in BOL), but it is official so I guess that those who answered "three (after, instead, clr)" should be awarded a point.
And maybe the question needs to be retracted...