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Just a general question since they didn't state this in the examiners report but were they expecting you to list all of these answers, one of these answers, or somewhere in between?
From the sample answers, it seems they only wanted 1 of those bullet points for the full 0.5 pts for each sub-part. And the question didn't specify 2 distinct points. The sample answers do seem a little short though because normally for 0.5 pts, you have to list 2 separate facts for 0.25 pts each. Looks like they were lenient here.