As evidenced below, questions on the quiz are marked incorrectly – in the first one (question 10), the answer is C, but is marked wrong. The modal at the bottom even clearly says A and B are wrong. In the second one, A is marked incorrect on the assumption that "IAM users cannot be assumed" despite the fact that answer A actually mentions IAM roles instead.
Obviously this isn’t a quiz made by ACG but recommending it to students might impair their learning progress.
Thanks for the feedback Aidan.