Ah, at least I know I got the question right :)
I'm 99.93% sure you won't face a question of this level in a 3u exam. I base that on the fact that, after searching ~1515 OCR'd 3u trials, I've come across only 1 other question similar to this- james ruse 3u 2003 trial, q7.
tbh, i wouldn't use...