Is it possible the interviewer was asking this question because they wanted to get a sense of if you were aware of which version was being used? And as follow on, were you part of the decision to update or not update, and your thoughts on the trade offs in that kind of scenario? Just a possibility. Certainly if the recruiter is asking you that, that’s a bad sign (although recruiters are often very detached from the thinking of the teams they’re hiring for).