Thompson Lee
Per the AWS documentation, an Availability Zone is one or more discrete data centers with redundant power, networking, and connectivity in an AWS Region.
https://aws.amazon.com/about-aws/global-infrastructure/regions_az/#Availability_Zones
In Chapter 2.4, Leveraging the AWS Global Infrastructure, at 04:11 into the video, we were reminded that we should remember an availability zone has multiple data centers when going into the exam. I believed this little part in the video is incorrect, and that we should assume it is possible for an availability zone to have 1 data center.
Is it safe to assume that there will be an exam question mentioning about this?
I would agree that the proper wording would be "may have multiple data centers". Often they do, but some may only have one. Those within a single datacenter obviously have some kind of local redundancy, else they wouldn’t be able to offer high availability.