Nice easy one today.

But the 17% mentioned above has gone up to 22% now.

Surprised that 60 people (22%) so far got it wrong; even people who don't know the answer should have been able to apply simple reasoning to see which of the four options has to have a witness. (Maybe seeing some of the bizarre decisions made by the designers of SQL/T-SQL discourages people from trying to use logic to get the answer?)