For what it's worth: I answered this question (cause I've had to do this one) through the daily update newsletter.
My initial answer was going to be 8 because the question was worded "at what memory point" and 8 being greater than 4, the threshold.
When I switched to a browser (to confirm my answer) I realised the wording was different, and chose the "more than 4GB" answer.
Jolly confusing or what? Not just the wording, but consistency of wording!