As with other posters... I got this wrong because the author did not take into account CASCADE options.
If he meant for CASCADE off as default he should have stated that.
Taken the question literally, the correct answers are 4 and 5.
Don't worry about my point, I've just taken one here instead... 😛
[font="Comic Sans MS"]"The difficult tasks we do immediately, the impossible takes a little longer"[/font]