I may be wrong but my take is that amazon like to switch things up when it comes to the exam. I think they still stay on topic to test who stays on top of updates. In this scenario at some point the right answer depends on what is either on their FAQ or documentation.

For anyone that care or in case the latest update is now here:

https://aws.amazon.com/about-aws/whats-new/2014/05/19/amazon-rds-for-sqlserver-introduces-multi-az-support/

https://aws.amazon.com/blogs/aws/amazon-rds-for-sql-server-with-multi-az/

http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_SQLServerMultiAZ.html

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