Getting an exposure is not quite the same as taking a picture but yes it is a bit ambiguous, I didn't have a course handbook to hand when I posted. Two pictures are required but you would need to establish a correct exposure first to take one either side of that that exploits the dynamic range.

Personally I would take a 'correct' picture while I was there anyway as it will help you to study the effects of taking the other two - it's a single frame so not a lot of effort or cost. You should be taking a lot more pictures than you submit - possibly to refer to in your assessment and certainly to keep as part of your own course notes, not to be submitted, that will build into your very own reference work.